OBSERVATION OF THE $2^{3}\Sigma^{+}_{g}-1^{3}\Sigma^{+}_{u}$ and $1^{3}\Pi_{g}-1^{3}\Sigma^{+}_{u}$ TRANSITIONS OF THE TRIPLET NaK MOLECULE ON THE SURFACE OF HELIUM CLUSTERS

Loading...
Thumbnail Image

Date

1996

Journal Title

Journal ISSN

Volume Title

Publisher

Ohio State University

Research Projects

Organizational Units

Journal Issue

Abstract

High spin (triplet) NaK dimers have been successfully prepared on the surface of helium clusters through a pick-up process in which a He cluster beam passes through two independent alkali pick-up cells, each containing an alkali vapor at pressures around $10^{2}$ Pa. Excitiation and emission spectra have been recorded for both the $2^{3}\Sigma^{+}_{g}-1^{3}\Sigma^{+}_{u}$ and $1^{3}\Pi_{g}-1^{3}\Sigma^{+}_{u}$ transitions. Comparisions of the experimental spectra with the theoretical calculations of Stevens et al.$1^{3}\Pi_{g}$ and of Jeung et $al.^{2}$ have been made obtaining information on the potenntial of the upper $1^{3}\Pi_{g}$ state. Similar comparisons with the work of Kowalczyk et $al.^{3}$ have made for the $2^{3}\Sigma^{+}_{g}-1^{3}\Sigma^{+}_{u}$ transition. Several different emission channels have beeen detected for each system following excitation, including atomic fluorescence and non-adiabatic corssings into the singlet manifold of the dimer. The emission spectra provide evidence of vibrational relaxation of the dimer on the He surface occuring on a time scale shorter than that of the molecular fluorescence.

Description

$^{1}$ W.J. Stevens, D.D. Konowalow, and Lyn B. Ratchiff, J. Chem. Phys. 80, 1215 (1984). $^{2}$ G.H. Jeung, J.P. Daudey, and J. P. Malricu, Chem. Phys. Lett. 94, 300 (1983). $^{3}$ W.P. Kowalczyk and N. Sadeghi, J. Chem. Phys. 102, 8321 (1995).
Author Institution: Department of Chemistry, Princeton University

Keywords

Citation