화학공학소재연구정보센터
Chemical Physics Letters, Vol.677, 1-6, 2017
Velocity map ion imaging and velocity-resolved action spectroscopy of H atom photofragments via Doppler-free multiphoton ionization
Hydrogen atom photofragments with high velocities in the laboratory frame lead to strong Doppler broadening of the (2 + 1) resonance-enhanced multiphoton ionization transition. Here, an alternative setup for Doppler-free ion imaging is demonstrated and explored for predissociation of methylamine and probing of H photofragments, at close wavelengths. This approach enables measurement of the entire velocity distributions in each laser pulse, enhances sensitivity and consequently provides acquisition of high quality H images and action spectra. These results shed light on dissociation dynamics and can be foreseen to be useful in revealing the dynamics in other molecular systems. (C) 2017 Elsevier B.V. All rights reserved.