Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Experimental Study of the NaK (3 1PI) State

Published

Author(s)

E Laub, J Huennekens, R K. Namiotka, Zeina J. Kubarych, I Prodan, J La civita, S Webb, I Mazsa

Abstract

We report the results of an optical-optical double resonance experiment to determine the NaK (3 1PI) state potential energy curve. In the first step, a narrow band cw laser (PUMP) is tuned to line center of a particular 2(A) (1 SIGMA+)(v?, J?) <-- 1(X) (1 SIGMA+)(v?, J?) transition, and its frequency is then fixed. A second narrow band tunable cw Ti-Sapphire laser (PROBE) is then scanned, while (3 1PI) --> 1(X) (1 SIGMA+) violet fluorescence is monitored. The Doppler-free signals accurately map the (3 1PI) (v, J) ro-vibrational energy levels. These energy levels are then fit to a Dunham expansion to provide a set of molecular constants. The Dunham constants, in turn, are used to construct an RKR potential curve. Resolved (3 1PI) (v, J) --> 1(X) (1 SIGMA+) (v?, J?) fluorescence scans are also recorded with both PUMP and PROBE laser frequencies fixed. Comparison between observed and calculated Franck-Condon factors is used to determine the absolute vibrational numbering of the (3 1PI) state levels and to determine the variation of the (3 1PI) --> 1(X) (1 SIGMA+) transition-dipole moment with internuclear separation. The recent theoretical calculation of the NaK (3 1PI) state potential reported by Magnier and Milli? (1996, Phys. Rev. A 54, 204) is in excellent agreement with the present experimental RKR curve.
Citation
Journal of Molecular Spectroscopy
Volume
193 (2)

Keywords

Molecular spectroscopy, Optical physics

Citation

Laub, E. , Huennekens, J. , Namiotka, R. , Kubarych, Z. , Prodan, I. , La civita, J. , Webb, S. and Mazsa, I. (1999), Experimental Study of the NaK (3 1PI) State, Journal of Molecular Spectroscopy (Accessed July 22, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created January 31, 1999, Updated October 12, 2021