Tapas Goswami

09 March 2026

• Researchgate
• Website

Education / Work History

• Assistant Professor, UPES India (2017–present)
• Ph.D. Scholar, IIT Kanpur (2010)
• M.Sc., University of Burdwan, West Bengal, India
• B.Sc., University of Burdwan, West Bengal, India

Thesis Abstract

Controlling laser induced photochemistry in supersonic molecular beam and probing ultrafast dynamics in liquid phase

My thesis deals with ultrafast studies in two important phases of matter: gas and liquid. The main aim of this thesis is to control some femtosecond laser induced photochemistry in supersonic molecular beam. An additional aim is to probe the ultrafast dynamics in more complicated system in the liquid phase using femtosecond degenerate pump-probe and photon echo spectroscopy technique. The thesis has been organized into seven chapters. The thesis starts with a brief discussion on the motivation behind the present work (Chapter 1). This introductory chapter also includes a brief introduction to coherent control and a short history of the molecular beam technique. In Chapter 2, the instrumentation part for the construction of supersonic molecular beam chamber with linear time of flight mass spectrometer is discussed in detail. In Chapter 3, different femtosecond laser systems used in the experiments, are described thoroughly. Different types of pulse characterization techniques are presented. Design and construction of a high power, white light seeded double pass non-collinear optical parametric amplifier (NOPA) in the visible wavelength using a simple amplifier crystal is also included. In Chapter 4, control of laser induced molecular fragmentation of n-propyl benzene using different control parameter of the laser pulses is described. In this chapter, first, the effect of chirping a femtosecond laser pulse on the fragmentation of n-propyl benzene is presented. Simultaneous effect of chirp and polarization as two control parameters for the non-resonant photodissociation of n-propyl benzene is also explored. In Chapter 5, using femtosecond time resolved degenerate pump-probe mass spectrometry; we elucidate that the dynamics of retro-Diels-Alder reaction of dicyclopentadiene (DCPD) to cyclopentadiene (CPD) in supersonic molecular beam occurs on ultrafast timescales. This femtosecond laser driven retro-Diels-Alder reaction is then controlled by using linearly chirped frequency modulated pulses. In Chapter 6, dependence of ultrafast dynamics for the excited state evolution and ground state recovery of a cyanine dye (IR125) in dichloromethane (DCM) solvent interfaced with neat water is presented. Excited state dynamics of some metal-octaethyl porphyrins (OEP) like Zn(II)-OEP, Ni(II)-OEP, Co(II)-OEP is studied by time evolving photon echo spectra for different values of coherence and population relaxation times. The concluding chapter, Chapter 7, summarizes all the work presented in the thesis. A future direction to the current work is proposed.

Research Topic / Interest

Contact me to know my current interests.

Publications

These include only those published in our lab.

1. Synthesis, Structure, and Two-Photon Absorption Studies of a Phosphorus-Based Tris Hydrazone Ligand (S)P[N(Me)N=CH-C6H3-2-OH-4-N(CH2CH3)2]3 and Its Metal Complexes. V. Chandrasekhar, R. Azhakar, B. Murugesapandian, T. Senapati, P. Bag, M. D. Pandey, S. K. Maurya, and D. Goswami, Inorganic Chemistry 49(9), 4008–4016 (2010) [BibTeX]

    BibTeX: @article{chandrasekharSynthesisStructureTwoPhoton2010,
     title = {Synthesis, {{Structure}}, and {{Two-Photon Absorption Studies}} of a {{Phosphorus-Based Tris Hydrazone Ligand}} ({{S}}){{P}}[{{N}}({{Me}}){{N}}={{CH-C6H3-2-OH-4-N}}({{CH2CH3}})2]3 and {{Its Metal Complexes}}},
     author = {Chandrasekhar, Vadapalli and Azhakar, Ramachandran and Murugesapandian, Balasubramanian and Senapati, Tapas and Bag, Prasenjit and Pandey, Mrituanjay D. and Maurya, Sandeep Kumar and Goswami, Debabrata},
     year = {2010},
     month = may,
     journal = {Inorganic Chemistry},
     volume = {49},
     number = {9},
     pages = {4008--4016},
     issn = {0020-1669},
     doi = {10/bvqgfp},
     urldate = {2019-08-14},
     annotation = {GSCC: 0000041 \\
     33 citations (Crossref) [2024-05-28]\\
     00030}
   }
   

2. Control of Femtosecond Laser Driven Retro-Diels-Alder-like Reaction of Dicyclopentadiene. D. K. Das, T. Goswami, and D. Goswami, in Photonics 2010: Tenth International Conference on Fiber Optics and Photonics (International Society for Optics and Photonics, 2011), 8173, p. 81730O [BibTeX]

    BibTeX: @inproceedings{dasControlFemtosecondLaser2011,
     title = {Control of Femtosecond Laser Driven Retro-{{Diels-Alder-like}} Reaction of Dicyclopentadiene},
     booktitle = {Photonics 2010: {{Tenth International Conference}} on {{Fiber Optics}} and {{Photonics}}},
     author = {Das, Dipak Kumar and Goswami, Tapas and Goswami, Debabrata},
     year = {2011},
     month = aug,
     volume = {8173},
     pages = {81730O},
     publisher = {{International Society for Optics and Photonics}},
     doi = {10/dsc8s7},
     urldate = {2019-08-13},
     annotation = {GSCC: 0000000 \\
     0 citations (Crossref) [2024-05-28]}
   }
   

3. Control of Laser Induced Molecular Fragmentation of N-Propyl Benzene Using Chirped Femtosecond Laser Pulses. T. Goswami, S. K. Karthick Kumar, A. Dutta, and D. Goswami, Chemical Physics 360(1), 47–52 (2009) [BibTeX]

    BibTeX: @article{goswamiControlLaserInduced2009,
     title = {Control of Laser Induced Molecular Fragmentation of N-Propyl Benzene Using Chirped Femtosecond Laser Pulses},
     author = {Goswami, Tapas and Karthick Kumar, S. K. and Dutta, Aveek and Goswami, Debabrata},
     year = {2009},
     month = jun,
     journal = {Chemical Physics},
     volume = {360},
     number = {1},
     pages = {47--52},
     issn = {0301-0104},
     doi = {10/b2h79c},
     urldate = {2019-08-14},
     annotation = {GSCC: 0000026 \\
     16 citations (Crossref) [2024-05-28]\\
     00023}
   }
   

4. Controlling the Femtosecond Laser-Driven Transformation of Dicyclopentadiene into Cyclopentadiene. T. Goswami, D. K. Das, and D. Goswami, Chemical Physics Letters 558, 1–7 (2013) [BibTeX]

    BibTeX: @article{goswamiControllingFemtosecondLaserdriven2013,
     title = {Controlling the Femtosecond Laser-Driven Transformation of Dicyclopentadiene into Cyclopentadiene},
     author = {Goswami, Tapas and Das, Dipak K. and Goswami, Debabrata},
     year = {2013},
     month = feb,
     journal = {Chemical Physics Letters},
     volume = {558},
     pages = {1--7},
     issn = {0009-2614},
     doi = {10/f4nnb2},
     urldate = {2019-08-02},
     annotation = {GSCC: 0000011 \\
     5 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

5. Hot Chemistry with Cold Molecules. T. Goswami and D. Goswami, in Laser Pulse Phenomena and Applications (BoD – Books on Demand, 2010), pp. 371–388 [BibTeX]

    BibTeX: @incollection{goswamiHotChemistryCold2010,
     title = {Hot {{Chemistry}} with {{Cold Molecules}}},
     booktitle = {Laser {{Pulse Phenomena}} and {{Applications}}},
     author = {Goswami, Tapas and Goswami, Debabrata},
     year = {2010},
     month = dec,
     pages = {371--388},
     publisher = {BoD -- Books on Demand},
     googlebooks = {5XSfDwAAQBAJ},
     isbn = {978-953-307-405-4},
     langid = {english},
     annotation = {GSCC: 0000746 \\
     00003}
   }
   

6. Probing the Ultrafast Solution Dynamics of a Cyanine Dye in an Organic Solvent Interfaced with Water. T. Goswami, S. K. K. Kumar, A. Dutta, and D. Goswami, The Journal of Physical Chemistry B 113(51), 16332–16336 (2009) [BibTeX]

    BibTeX: @article{goswamiProbingUltrafastSolution2009,
     title = {Probing the {{Ultrafast Solution Dynamics}} of a {{Cyanine Dye}} in an {{Organic Solvent Interfaced}} with {{Water}}},
     author = {Goswami, Tapas and Kumar, S. K. Karthick and Dutta, Aveek and Goswami, Debabrata},
     year = {2009},
     month = dec,
     journal = {The Journal of Physical Chemistry B},
     volume = {113},
     number = {51},
     pages = {16332--16336},
     issn = {1520-6106},
     doi = {10/dc3b67},
     urldate = {2019-08-14},
     annotation = {9 citations (Crossref) [2024-05-28]\\
     00007}
   }
   

7. Towards Using Molecular Ions as Qubits: Femtosecond Control of Molecular Fragmentation with Multiple Knobs. T. Goswami, D. K. Das, and D. Goswami, Pramana 75(6), 1065–1069 (2010) [BibTeX]

    BibTeX: @article{goswamiUsingMolecularIons2010,
     title = {Towards Using Molecular Ions as Qubits: {{Femtosecond}} Control of Molecular Fragmentation with Multiple Knobs},
     shorttitle = {Towards Using Molecular Ions as Qubits},
     author = {Goswami, Tapas and Das, Dipak K. and Goswami, Debabrata},
     year = {2010},
     month = dec,
     journal = {Pramana},
     volume = {75},
     number = {6},
     pages = {1065--1069},
     issn = {0973-7111},
     doi = {10/cf945s},
     urldate = {2019-08-14},
     langid = {english},
     annotation = {GSCC: 0000000 \\
     0 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

8. Towards Using Molecular States as Qubits. D. Goswami, T. Goswami, S. K. K. Kumar, and D. K. Das, AIP Conference Proceedings 1384(1), 251–253 (2011) [BibTeX]

    BibTeX: @article{goswamiUsingMolecularStates2011,
     title = {Towards {{Using Molecular States}} as {{Qubits}}},
     author = {Goswami, Debabrata and Goswami, Tapas and Kumar, S. K. Karthick and Das, Dipak K.},
     year = {2011},
     month = sep,
     journal = {AIP Conference Proceedings},
     volume = {1384},
     number = {1},
     pages = {251--253},
     issn = {0094-243X},
     doi = {10/bfnp4m},
     urldate = {2019-08-02},
     annotation = {GSCC: 0000000 \\
     0 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

9. Structure and Hydrogen Bond Vibrations of the Jet-Cooled 1:1 Complex between 7-Azaindole and Formamide: A Laser-Induced Fluorescence Spectroscopy Study. M. K. Hazra, M. Mukherjee, D. Goswami, and T. Chakraborty, Chemical Physics Letters 503(4), 203–209 (2011) [BibTeX]

    BibTeX: @article{hazraStructureHydrogenBond2011,
     title = {Structure and Hydrogen Bond Vibrations of the Jet-Cooled 1:1 Complex between 7-Azaindole and Formamide: {{A}} Laser-Induced Fluorescence Spectroscopy Study},
     shorttitle = {Structure and Hydrogen Bond Vibrations of the Jet-Cooled 1},
     author = {Hazra, Montu K. and Mukherjee, Moitrayee and Goswami, Debabrata and Chakraborty, Tapas},
     year = {2011},
     month = feb,
     journal = {Chemical Physics Letters},
     volume = {503},
     number = {4},
     pages = {203--209},
     issn = {0009-2614},
     doi = {10/bj9kdz},
     urldate = {2019-08-13},
     annotation = {GSCC: 0000008 \\
     7 citations (Crossref) [2024-05-28]}
   }
   

10. Spectrally Resolved Photon Echo Spectroscopy of Zn(II), Co(II) and Ni(II)–Octaethyl Porphyrins. S. K. Karthick Kumar, V. Tiwari, T. Goswami, and D. Goswami, Chemical Physics Letters 476(1), 31–36 (2009) [BibTeX]

     BibTeX: @article{karthickkumarSpectrallyResolvedPhoton2009,
      title = {Spectrally Resolved Photon Echo Spectroscopy of {{Zn}}({{II}}), {{Co}}({{II}}) and {{Ni}}({{II}})--Octaethyl Porphyrins},
      author = {Karthick Kumar, S. K. and Tiwari, Vivek and Goswami, Tapas and Goswami, Debabrata},
      year = {2009},
      month = jul,
      journal = {Chemical Physics Letters},
      volume = {476},
      number = {1},
      pages = {31--36},
      issn = {0009-2614},
      doi = {10/fpmh7d},
      urldate = {2019-08-14},
      annotation = {GSCC: 0000004 \\
      4 citations (Crossref) [2024-05-28]\\
      00004}
    }
    

11. Hot Chemistry with Cold Molecules. T. Goswami and D. Goswami, in Laser Pulse Phenomena and Applications (BoD – Books on Demand, 2010), pp. 371–388 [BibTeX]

     BibTeX: @incollection{goswamiHotChemistryCold2011,
      title = {Hot {{Chemistry}} with {{Cold Molecules}}},
      booktitle = {Laser {{Pulse Phenomena}} and {{Applications}}},
      author = {Goswami, Tapas and Goswami, Debabrata},
      year = {2010},
      month = dec,
      pages = {371--388},
      publisher = {BoD -- Books on Demand},
      googlebooks = {5XSfDwAAQBAJ},
      isbn = {978-953-307-405-4},
      langid = {english},
      annotation = {GSCC: 0000746 \\
      00003}
    }
    

12. Synthesis, Structure, and Two-Photon Absorption Studies of a Phosphorus-Based Tris Hydrazone Ligand (S)P[N(Me)N=CH-C6H3-2-OH-4-N(CH2CH3)2]3 and Its Metal Complexes. V. Chandrasekhar, R. Azhakar, B. Murugesapandian, T. Senapati, P. Bag, M. D. Pandey, S. K. Maurya, and D. Goswami, Inorganic Chemistry 49(9), 4008–4016 (2010) [BibTeX]

     BibTeX: @article{chandrasekharSynthesisStructureTwoPhoton2011,
      title = {Synthesis, {{Structure}}, and {{Two-Photon Absorption Studies}} of a {{Phosphorus-Based Tris Hydrazone Ligand}} ({{S}}){{P}}[{{N}}({{Me}}){{N}}={{CH-C6H3-2-OH-4-N}}({{CH2CH3}})2]3 and {{Its Metal Complexes}}},
      author = {Chandrasekhar, Vadapalli and Azhakar, Ramachandran and Murugesapandian, Balasubramanian and Senapati, Tapas and Bag, Prasenjit and Pandey, Mrituanjay D. and Maurya, Sandeep Kumar and Goswami, Debabrata},
      year = {2010},
      month = may,
      journal = {Inorganic Chemistry},
      volume = {49},
      number = {9},
      pages = {4008--4016},
      issn = {0020-1669},
      doi = {10/bvqgfp},
      urldate = {2019-08-14},
      annotation = {GSCC: 0000041 \\
      33 citations (Crossref) [2024-05-28]\\
      00030}
    }
    

13. Control of Femtosecond Laser Driven Retro-Diels-Alder-like Reaction of Dicyclopentadiene. D. K. Das, T. Goswami, and D. Goswami, in Photonics 2010: Tenth International Conference on Fiber Optics and Photonics (International Society for Optics and Photonics, 2011), 8173, p. 81730O [BibTeX]

     BibTeX: @inproceedings{dasControlFemtosecondLaser2012,
      title = {Control of Femtosecond Laser Driven Retro-{{Diels-Alder-like}} Reaction of Dicyclopentadiene},
      booktitle = {Photonics 2010: {{Tenth International Conference}} on {{Fiber Optics}} and {{Photonics}}},
      author = {Das, Dipak Kumar and Goswami, Tapas and Goswami, Debabrata},
      year = {2011},
      month = aug,
      volume = {8173},
      pages = {81730O},
      publisher = {{International Society for Optics and Photonics}},
      doi = {10/dsc8s7},
      urldate = {2019-08-13},
      annotation = {GSCC: 0000000 \\
      0 citations (Crossref) [2024-05-28]}
    }
    

14. Control of Laser Induced Molecular Fragmentation of N-Propyl Benzene Using Chirped Femtosecond Laser Pulses. T. Goswami, S. K. Karthick Kumar, A. Dutta, and D. Goswami, Chemical Physics 360(1), 47–52 (2009) [BibTeX]

     BibTeX: @article{goswamiControlLaserInduced2010,
      title = {Control of Laser Induced Molecular Fragmentation of N-Propyl Benzene Using Chirped Femtosecond Laser Pulses},
      author = {Goswami, Tapas and Karthick Kumar, S. K. and Dutta, Aveek and Goswami, Debabrata},
      year = {2009},
      month = jun,
      journal = {Chemical Physics},
      volume = {360},
      number = {1},
      pages = {47--52},
      issn = {0301-0104},
      doi = {10/b2h79c},
      urldate = {2019-08-14},
      annotation = {GSCC: 0000026 \\
      16 citations (Crossref) [2024-05-28]\\
      00023}
    }
    

15. Controlling the Femtosecond Laser-Driven Transformation of Dicyclopentadiene into Cyclopentadiene. T. Goswami, D. K. Das, and D. Goswami, Chemical Physics Letters 558, 1–7 (2013) [BibTeX]

     BibTeX: @article{goswamiControllingFemtosecondLaserdriven2014,
      title = {Controlling the Femtosecond Laser-Driven Transformation of Dicyclopentadiene into Cyclopentadiene},
      author = {Goswami, Tapas and Das, Dipak K. and Goswami, Debabrata},
      year = {2013},
      month = feb,
      journal = {Chemical Physics Letters},
      volume = {558},
      pages = {1--7},
      issn = {0009-2614},
      doi = {10/f4nnb2},
      urldate = {2019-08-02},
      annotation = {GSCC: 0000011 \\
      5 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

16. Probing the Ultrafast Solution Dynamics of a Cyanine Dye in an Organic Solvent Interfaced with Water. T. Goswami, S. K. K. Kumar, A. Dutta, and D. Goswami, The Journal of Physical Chemistry B 113(51), 16332–16336 (2009) [BibTeX]

     BibTeX: @article{goswamiProbingUltrafastSolution2010,
      title = {Probing the {{Ultrafast Solution Dynamics}} of a {{Cyanine Dye}} in an {{Organic Solvent Interfaced}} with {{Water}}},
      author = {Goswami, Tapas and Kumar, S. K. Karthick and Dutta, Aveek and Goswami, Debabrata},
      year = {2009},
      month = dec,
      journal = {The Journal of Physical Chemistry B},
      volume = {113},
      number = {51},
      pages = {16332--16336},
      issn = {1520-6106},
      doi = {10/dc3b67},
      urldate = {2019-08-14},
      annotation = {9 citations (Crossref) [2024-05-28]\\
      00007}
    }
    

17. Towards Using Molecular Ions as Qubits: Femtosecond Control of Molecular Fragmentation with Multiple Knobs. T. Goswami, D. K. Das, and D. Goswami, Pramana 75(6), 1065–1069 (2010) [BibTeX]

     BibTeX: @article{goswamiUsingMolecularIons2011,
      title = {Towards Using Molecular Ions as Qubits: {{Femtosecond}} Control of Molecular Fragmentation with Multiple Knobs},
      shorttitle = {Towards Using Molecular Ions as Qubits},
      author = {Goswami, Tapas and Das, Dipak K. and Goswami, Debabrata},
      year = {2010},
      month = dec,
      journal = {Pramana},
      volume = {75},
      number = {6},
      pages = {1065--1069},
      issn = {0973-7111},
      doi = {10/cf945s},
      urldate = {2019-08-14},
      langid = {english},
      annotation = {GSCC: 0000000 \\
      0 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

18. Towards Using Molecular States as Qubits. D. Goswami, T. Goswami, S. K. K. Kumar, and D. K. Das, AIP Conference Proceedings 1384(1), 251–253 (2011) [BibTeX]

     BibTeX: @article{goswamiUsingMolecularStates2012,
      title = {Towards {{Using Molecular States}} as {{Qubits}}},
      author = {Goswami, Debabrata and Goswami, Tapas and Kumar, S. K. Karthick and Das, Dipak K.},
      year = {2011},
      month = sep,
      journal = {AIP Conference Proceedings},
      volume = {1384},
      number = {1},
      pages = {251--253},
      issn = {0094-243X},
      doi = {10/bfnp4m},
      urldate = {2019-08-02},
      annotation = {GSCC: 0000000 \\
      0 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

19. Structure and Hydrogen Bond Vibrations of the Jet-Cooled 1:1 Complex between 7-Azaindole and Formamide: A Laser-Induced Fluorescence Spectroscopy Study. M. K. Hazra, M. Mukherjee, D. Goswami, and T. Chakraborty, Chemical Physics Letters 503(4), 203–209 (2011) [BibTeX]

     BibTeX: @article{hazraStructureHydrogenBond2012,
      title = {Structure and Hydrogen Bond Vibrations of the Jet-Cooled 1:1 Complex between 7-Azaindole and Formamide: {{A}} Laser-Induced Fluorescence Spectroscopy Study},
      shorttitle = {Structure and Hydrogen Bond Vibrations of the Jet-Cooled 1},
      author = {Hazra, Montu K. and Mukherjee, Moitrayee and Goswami, Debabrata and Chakraborty, Tapas},
      year = {2011},
      month = feb,
      journal = {Chemical Physics Letters},
      volume = {503},
      number = {4},
      pages = {203--209},
      issn = {0009-2614},
      doi = {10/bj9kdz},
      urldate = {2019-08-13},
      annotation = {GSCC: 0000008 \\
      7 citations (Crossref) [2024-05-28]}
    }
    

20. Spectrally Resolved Photon Echo Spectroscopy of Zn(II), Co(II) and Ni(II)–Octaethyl Porphyrins. S. K. Karthick Kumar, V. Tiwari, T. Goswami, and D. Goswami, Chemical Physics Letters 476(1), 31–36 (2009) [BibTeX]

     BibTeX: @article{karthickkumarSpectrallyResolvedPhoton2010,
      title = {Spectrally Resolved Photon Echo Spectroscopy of {{Zn}}({{II}}), {{Co}}({{II}}) and {{Ni}}({{II}})--Octaethyl Porphyrins},
      author = {Karthick Kumar, S. K. and Tiwari, Vivek and Goswami, Tapas and Goswami, Debabrata},
      year = {2009},
      month = jul,
      journal = {Chemical Physics Letters},
      volume = {476},
      number = {1},
      pages = {31--36},
      issn = {0009-2614},
      doi = {10/fpmh7d},
      urldate = {2019-08-14},
      annotation = {GSCC: 0000004 \\
      4 citations (Crossref) [2024-05-28]\\
      00004}
    }