Aparajeo Chattopadhyay


Chemical Processes & Instrument Development




  • Ph.D. Physical Chemistry, Indian Association for the Cultivation of Science, India (degree awarded by University of Calcutta, Advisor: Professor Tapas Chakraborty), 2018.
  • M.Sc. Chemistry (Special in Physical Chemistry), University of Calcutta, India, 2011.


Atmospheric chemistry, Gas kinetics, Photochemistry, Spectroscopy, Air quality, Climate forcing.

Current Topics

  • Atmospheric chemistry of air pollutants such as biomass burning compounds, and volatile chemical products. My studies include detailed kinetics for the gas-phase reactions with atmospheric oxidants such as OH radical, Cl atom as well as photochemistry (photolysis quantum yields, UV absorption spectra) to determine the atmospheric lifetimes. I also study atmospheric degradation mechanisms with the support of product measurements.
  • Atmospheric chemistry of CFC replacement compounds such as hydrofluoroolefins (HFOs) and perfluoroolefins (PFOs). Our measurements include atmospheric lifetimes, infrared spectra, and climate metrics, i.e., radiative efficiencies (REs) and global warming potentials (GWPs). The climate metrics are used in environmental policymaking.
Cooperative Institute for Research in Environmental Sciences National Oceanic and Atmospheric Administration

last modified: May 31, 2023

last modified: September 30, 2023