ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The collision-induced deactivation of H2CO in a specific rotational level in its first electronically excited singlet state, A˜ 1A2, v4=1, JKa,Kc=132,12, has been investigated with a series of colliders, M=He, Ar, Xe, and N2. The target level was populated via the transition A˜←X˜, 410, 132,12←133,11 using a pulsed dye laser. The subsequent relaxation was monitored using the technique of transient gain spectroscopy (TGS) via the transition A˜→X˜, 201301414, 132,12→131,13, which coincides with the line of an Ar+ laser at λ=488.0 nm. The experiments yielded the overall collisional depopulation rate constants (velocity averaged cross sections) for He, Ar, Xe, and N2, respectively: (5.25±0.20)×10−10 cm3/molecule s (39 A(ring)2), (5.22±0.18)×10−10 cm3/molecule s (86 A(ring)2), (5.37±0.29)×10−10 cm3/molecule s (106 A(ring)2), (8.25±0.29)×10−10 cm3/molecule s (125 A(ring)2), where the uncertainties correspond to the 2σ standard deviations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.457224
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