Velocity dependence of electronic excitation transfer reactions: (CO*,N$sub 2$*,Kr*)+Hg(6 $sup 1$$S$$sub 0$) $Yields$ (CO,N$sub 2$,Kr)+Hg(6 $sup 3$$P$$sub 1$)

Journal Article · Thu Jan 15 04:00:00 EST 1976 · J. Chem. Phys., v. 64, no. 2, pp. 678-685

OSTI ID:4071322

Lee, W; Martin, R M

The velocity dependences of the sensitized fluorescence of mercury by metastable CO(a $sup 3$Pi), N$sub 2$(A $sup 3$$Sigma$$sup +$/subu/), and Kr(5 $sup 3$$P$$sub 2$$,$$sub 0$) were determined using crossed molecular beams with the metastable beams time-of-flight velocity selected. With CO(a) and N$sub 2$(A) excitation is directly to Hg(6 $sup 3$$P$$sub 1$), whereas with Kr($sup 3$P) higher triplet states of mercury are also excited. The collisional energy ranges studied with CO, N$sub 2$, and Kr were 32--516, 30--468, and 31--394 meV, respectively. The cross section collisional velocity dependence was found to be quite similar for the three systems, with a negative v$sup -$/subn/ velocity dependence in the low velocity region becoming neutral or positive at higher velocities. The values of n were 0.750+-0.014 for CO(a) + Hg up to 242 meV, 1.009+-0.016 for N$sub 2$(A) + Hg up to 202 meV, and 0.810+-0.024 for Kr($sup 3$P) + Hg up to 140 meV. The results are compared with velocity dependences of other nonadiabatic reactions, and discussed in terms of electronic coupling vs curve crossing theories for such processes. (AIP)

• Research Organization: Department of Chemistry, University of California, Santa Barbara, California 93106
• NSA Number: NSA-33-021201
• OSTI ID: 4071322
• Journal Information: J. Chem. Phys., v. 64, no. 2, pp. 678-685, Journal Name: J. Chem. Phys., v. 64, no. 2, pp. 678-685; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

*CARBON MONOXIDE-- ATOM-MOLECULE COLLISIONS
*KRYPTON-- ATOM-ATOM COLLISIONS
*MERCURY-- ATOM-MOLECULE COLLISIONS
*NITROGEN-- ATOM-MOLECULE COLLISIONS
640304* --Physics Research--Atomic
Molecular & Chemical Physics--Collision Phenomena
EXCITATION
FLUORESCENCE
MILLI EV RANGE
N60400* --Physics (Atomic & Molecular)--Collision Phenomena