Ashwini Kumar Rawat

IIT Kanpur

Education / Work History

  • Ph.D. Scholar, IIT Kanpur (2015-present)
  • M.Sc., Aligarh Muslim University, (2014)
  • B.Sc., Aligarh Muslim University, (2012)

Research Topic / Interest

Email me here to know more about my work or ask me to update this. My interest is mainly in thermal lens spectroscopy.

Publications

No publications yet.

  1. Sensing the Molecular Properties in Methanol and Its Binary Mixtures Using Time-Resolved Thermal Lens Spectrometer. S. Chakraborty, A. K. Rawat, and D. Goswami, in 2019 Workshop on Recent Advances in Photonics (WRAP) (2019), pp. 1–3 [Abstract] [BibTeX]

    Abstract: Mode Mismatched Pump-Probe spectroscopic method was employed to examine the thermally induced nonlinear optical properties of methanol and its binary mixtures. The heat transfer mechanism in methanol and its binary mixtures with carbon tetrachloride (CCl4) at different concentrations of methanol is investigated. Methanol has the highest Thermal Lens (TL) signal, and CCl4 does not have any TL signal at all. However, the presence of CCl4 modulates the TL signal of the binary mixture. The time-domain shift in TL signal is observed for different concentrations of methanol, which indicates the unusual molecular behavior in the binary mixture.

     BibTeX: @inproceedings{chakrabortySensingMolecularProperties2019,
  title = {Sensing the {{Molecular Properties}} in {{Methanol}} and Its {{Binary Mixtures}} Using {{Time}}-{{Resolved Thermal Lens Spectrometer}}},
  booktitle = {2019 {{Workshop}} on {{Recent Advances}} in {{Photonics}} ({{WRAP}})},
  author = {Chakraborty, Subhajit and Rawat, Ashwini Kumar and Goswami, Debabrata},
  date = {2019-12},
  pages = {1--3},
  issn = {null},
  doi = {10.1109/WRAP47485.2019.9013697},
  eventtitle = {2019 {{Workshop}} on {{Recent Advances}} in {{Photonics}} ({{WRAP}})},
  keywords = {Femtosecond Laser,Nonlinear Optics,Nonlinear Spectroscopy,Thermal Lens}
}
  2. Ultrafast Insights for Predictive Fragrance Compounding. D. Goswami, R. Goswami, A. Kumar Rawat, and D. Chakrabarty, in (2020) [PDF] [BibTeX] 
     BibTeX: @inproceedings{goswamiUltrafastInsightsPredictive2020,
  title = {Ultrafast Insights for Predictive Fragrance Compounding},
  author = {Goswami, Debabrata and Goswami, Rohit and Kumar Rawat, Ashwini and Chakrabarty, Debojit},
  date = {2020-04-29},
  doi = {10.1021/scimeetings.0c03998},
  url = {https://www.morressier.com/article/5e73d6ce139645f83c2299c8},
  urldate = {2020-07-11},
  eventtitle = {{{ACS Spring}} 2020 {{National Meeting}} \& {{Expo}}}
}
  3. Two-Photon-Induced Fluorescence Study of Rhodamine-6G Dye in Different Sets of Binary Solvents. R. K. Gupta, S. Kant, A. K. Rawat, and D. Goswami, Journal of Fluorescence (2020) [Abstract] [PDF] [BibTeX]

    Abstract: This study deals with the effects of different sets of binary solvents on the Two-Photon Induced Fluorescence (TPIF), a non-linear process, of the Rhodamine-6G (Rh6G) dye, which is a well-known xanthene dye. This work examines the importance of inter-molecular interactions, which results in the modulation of the TPIF of the Rh6G. In this work, we have investigated three binary solvent mixtures representing varying polarity and intermolecular interactions. Specific solvent mixtures used are methanol-water, methanol-dimethyl formamide, and methanol-chloroform. Since the solvent polarity across these binary solvents differs, there are significant intermolecular interactions in the binary mixture solvents, which modulate the two-photon process of Rh6G when irradiated with high-intensity laser light at 780 nm. In our studies, we find that Rh6G in the MeOH-H2O binary solvent has maximum red-shift and minimum intensity as compared to other pairs of binary liquids when the volume fraction of methanol decreases due to more extensive hydrogen bonding between the two components. Additionally, at 1:1 ratio of binary mixtures, Rh6G is found to have the highest TPEACS value for methanol-chloroform binary solvent and reason for that is related to the formation of weak H-bond networks between proton donor chloroform and proton acceptor methanol.

     BibTeX: @article{guptaTwoPhotonInducedFluorescenceStudy2020,
  ids = {guptaTwoPhotonInducedFluorescenceStudy2020a},
  title = {Two-{{Photon}}-{{Induced Fluorescence Study}} of {{Rhodamine}}-{{6G Dye}} in {{Different Sets}} of {{Binary Solvents}}},
  author = {Gupta, Rahul Kumar and Kant, Surya and Rawat, Ashwini Kumar and Goswami, Debabrata},
  date = {2020-07-01},
  journaltitle = {Journal of Fluorescence},
  shortjournal = {J Fluoresc},
  issn = {1573-4994},
  doi = {10.1007/s10895-020-02577-0},
  url = {10.1007/s10895-020-02577-0},
  urldate = {2020-07-11},
  langid = {english}
}
  4. Thermal Inflection Study of Methanol-Hexane Mixtures Using Time-Resolved Thermal Lens Technique. A. K. Rawat, S. Chakraborty, and D. Goswami, in 2019 Workshop on Recent Advances in Photonics (WRAP) (2019), pp. 1–3 [Abstract] [PDF] [BibTeX]

    Abstract: Time-resolved thermal lens (TL) technique is used to measure the heat transfer in pure methanol and its binary mixtures with hexane. We used dual-beam mode mismatched pump-probe scheme where a femtosecond laser beam of 1560 nm was used as a pump beam, and its frequency-doubled 780 nm beam was used as probe beam. TL Signal decreases with increasing concentration of hexane in the binary mixture. On higher concentration of Hexane in binary mixture then we have found convective heat transfer mode was absent. At 40%-60% methanol hexane mixture, we observed a sudden curious jump in TL signal.

     BibTeX: @inproceedings{rawatThermalInflectionStudy2019,
  ids = {rawatThermalInflectionStudy2019a},
  title = {Thermal {{Inflection Study}} of {{Methanol}}-{{Hexane Mixtures}} Using {{Time}}-{{Resolved Thermal Lens Technique}}},
  booktitle = {2019 {{Workshop}} on {{Recent Advances}} in {{Photonics}} ({{WRAP}})},
  author = {Rawat, Ashwini Kumar and Chakraborty, Subhajit and Goswami, Debabrata},
  date = {2019-12},
  pages = {1--3},
  issn = {null},
  doi = {10.1109/WRAP47485.2019.9013736},
  url = {10.1109/WRAP47485.2019.9013736},
  eventtitle = {2019 {{Workshop}} on {{Recent Advances}} in {{Photonics}} ({{WRAP}})},
  keywords = {binary mixture,convection,convective heat transfer mode,dual-beam mode mismatched pump-probe scheme,Femtosecond Laser,femtosecond laser beam,frequency-doubled 780 nm beam,Heating systems,laser beams,Laser beams,Laser excitation,Lenses,Measurement by laser beam,Methanol,methanol-hexane mixtures,mixtures,Nonlinear Spectroscopy,optical pumping,organic compounds,probe beam,pump beam,pure methanol,thermal inflection,Thermal lens,thermal lensing,Thermal lensing,time resolved spectra,time-resolved thermal lens technique,TL signal,Ultrafast Optics,wavelength 1560.0 nm,wavelength 780.0 nm}
}

Conferences

No information found.