Rabi Chhantyal Pun

PhD (Ohio State University)

  • Laser Spectroscopy and PGOPHER
  • Atmospheric Chemistry

My research in the Bristol Laser Chemistry Spectroscopy & Dynamics group is focused on the structure and reactivity of Criegee intermediates and peroxy radicals. I use cavity ring-down spectroscopy (CRDS) and cavity enhanced absorption spectroscopy (CEAS) to probe these highly reactive species in the time and frequency domains under atmospherically relevant conditions. Results from this research are being used in atmospheric modelling studies, in collaboration with Prof Dudley Shallcross. My current research is supported by the research grant described here:

My full publication list can be found at:

I have also organized various outreach events and descriptions can be found here:

Relevant publication(s)

Temperature dependence of the rates of reaction of trifluoroacetic acid with Criegee intermediates, Rabi Chhantyal-Pun et al. Angew. Chem. Int. Ed. 2017, 56, 9044-9047

A kinetic study of the CH2OO Criegee intermediate self-reaction, reaction with SO2 and unimolecular reaction using cavity ring-down spectroscopy, Rabi Chhantyal-Pun et al. Phys. Chem. Chem. Phys. 2015, 17, 3617-3626

Jet-cooled laser induced fluorescence spectroscopy of isopropoxy radical: vibronic analysis of B-X and B-A band systems, Rabi Chhantyal-Pun et al. J. Phys. Chem. A, 2014, 118, 11852-11870

Detection and Characterization of Products from Photodissociation of XCH2CH2ONO (X = F, Cl, Br and OH), Rabi Chhantyal-Pun, Ming-Wei Chen, Dianping Sun, Terry A Miller, J. Phys. Chem. A, 116 12032-12040 (2012)

Measurement of the Absolute Absorption Cross Sections of the A←X Transition in the Organic Peroxy Radicals by Dual Wavelength Cavity Ring Down Spectroscopy, Dmitry Melnik, Rabi Chhantyal-Pun, Terry A Miller, J. Phys. Chem. A 114 11583-11594 (2010)

Observation of the A←X  Electronic Transition of β-Hydroxyethylperoxy Radical, Rabi Chhantyal-Pun, Neal D Kline, Phillip S Thomas, Terry A Miller, J. Phys. Chem. Lett. 1 1846-1852 (2010)