TITLE

State specific electronic quenching rates for the N2 a 1Πg(v=0) level from collisions with He, Ar, and N2

AUTHOR(S)
Katayama, Daniel H.; Dentamaro, Anthony V.; Welsh, Judith A.
PUB. DATE
December 1994
SOURCE
Journal of Chemical Physics;12/1/1994, Vol. 101 Issue 11, p9422
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The technique of double, resonance enhanced multiphoton ionization (REMPI) spectroscopy has been used to observe collision induced electronic transitions (CIET) and rotational energy transfer (RET) from a selectively excited rotational level of the N2 a 1Πg (v=0) rotational manifold. A direct comparison of these two processes under the same experimental and single collision conditions is demonstrated for the first time and the results show clearly that CIET to the a’ 1∑-u(v=0) rotational levels occur prior to rotational equilibration in the a 1Πg manifold. The collision partners are He, Ar, and N2. There is a general propensity for ΔJ≊0 but detailed changes in the collisional selection rules for CIET are difficult to observe for the different colliding partners except for N2 where there is a fraction of E–E transfer that allows antisymmetric to symmetric transitions to be observable. The double REMPI experiments allow the determination of collisional deactivation paths and energy gaps. CIET from the a 1Πg(v=0) to the a’ 1∑-u(v=1) level which is endothermic by 295 cm-1 is observed for the first time at room temperature. From the determination of these deactivation paths a collisional quenching model is derived and state specific quenching rates are determined from pressure dependent radiative decay curves as a function of temperature for each of the collision partners. © 1994 American Institute of Physics.
ACCESSION #
7610333

 

Related Articles

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics