J. Phys. Chem. 1992, 96, 7013-7018
7013
long-lived electronically excited rare gas deuterides, XeD(A2ZIl2+) and KrD(A2ZIl2+).
Acknowledgment. This work was supported by the US. Department of Energy and the donors of the Petroleum Research Fund, administered by the American Chemical Society, to R.B. and the Monbusho International Scientific Program and a Grant-in-Aid from the Ministry of Education, Science and Culture of Japan to M.K.
Appendix The two excited states in question with electron configurations 5ps6p and 5ps6s are labeled p and s, respectively, and have radiative decay rates kRpand k b and quenching rates k e and k,, respectively. An atom in the upper state p radiates to state s and thence to the ground state. If the populations of the two states are also labeled p and s, the rates of radiation from the two states are kRpP and kR$, respectively, the rate equations for the populations can be written as dp/dt = -(kQp(H2) + kRpb h / d t = -(kQs(H2)
+ kRsb + kRp
(AI) (A2)
The total fluorescent radiation I p from the p state is given by the integral kRpJomp(t) dt. If we divide the intensity in the absence of H2 by that in its presence, we obtain the equation Iop/Ip
= 1 + (kQp/kRp)(HS)
(A31
with a similar expression for the intensity ratios of the radiation emitted by the atom in state s:
The coefficients of (H2) in eqs A3 and A4 are nearly equal, and therefore, we have the inequality k ~ d k
