No data available.

Please log in to see this content.

You have no subscription access to this content.

No metrics data to plot.

The attempt to load metrics for this article has failed.

The attempt to plot a graph for these metrics has failed.

The full text of this article is not currently available.

Fourier-transform spectroscopy of (4)

^{1}Σ

^{+} →

*A* ^{1}Σ

^{+} −

*b* ^{3}Π,

*A* ^{1}Σ

^{+} −

*b* ^{3}Π →

*X* ^{1}Σ

^{+}, and transitions in KCs and deperturbation treatment of

*A* ^{1}Σ

^{+} and

*b* ^{3}Π states

### Abstract

High resolution Fourier-transform spectroscopy data of term values in the spin-orbit (SO) coupled first excited A ^{1}Σ^{+} and b ^{3}Π states in KCs were obtained from (4)^{1}Σ^{+} → A ^{1}Σ^{+} − b ^{3}Π, A ^{1}Σ^{+} − b ^{3}Π → X ^{1}Σ^{+}, and spectra of laser-induced fluorescence (LIF). About 3000 new rovibronic term values of the A ^{1}Σ^{+} and states were obtained with an uncertainty about 0.01 cm^{−1} and added to the previously obtained 3439 term values in Kruzins et al. [Phys. Rev. A81, 042509 (2010)] and 30 term values of the state levels below the A ^{1}Σ^{+} state in Tamanis et al. [Phys. Rev. A82, 032506 (2010)]. The data field was extended considerably, going down to vibrational level v b = 0 and up in energy to 13 814 cm^{−1}, as compared to previously achieved v b = 14 and E = 13 250 cm^{−1}. Overall 6431 e-symmetry term values of ^{39}K^{133}Cs were included in 4 × 4 coupled-channel deperturbation analysis. The analytical Morse-Long-Range (MLR) function yielded empirical diabatic potentials for the A ^{1}Σ^{+} and states while the morphing of the SO ab initio points [J. T. Kim et al. , J. Mol. Spectrosc.256, 57 (2009)] provided the empirical diagonal and off-diagonal SO functions. Overall 98.5% of the fitted term values were reproduced with a rms (root mean square) uncertainty of 0.004 cm^{−1}. The reliability of the model is proved by a good agreement of predicted and measured term values of the ^{41}K^{133}Cs isotopologue, as well as of measured and calculated intensities of (4)^{1}Σ^{+} → A ^{1}Σ^{+} − b ^{3}Π LIF progressions. Direct-potential-fit of low-lying v b levels of the component yielded the MLR potential which represents the 204 f-symmetry experimental term values with a rms uncertainty of 0.002 cm^{−1}. The Ω-doubling of the b ^{3}Π0 sub-state demonstrates a pronounced v b -dependent increase.

© 2013 AIP Publishing LLC

Received 01 October 2013
Accepted 25 November 2013
Published online 23 December 2013

Acknowledgments:
The support from Latvian Science Council, Grant No. 119/2012 is gratefully acknowledged by Riga team. The Moscow team thanks for partial support the Russian Foundation for Basic Researches (Research Project No. 13-03-00466a).

Article outline:

I. INTRODUCTION
II. EXPERIMENTAL
A. Experimental details
B. The LIF spectra analysis
1. transition
2. transition
3. transition: Observation and assignment
III. DEPERTURBATION ANALYSIS
A. The complex
B. The state
C. Representation of potential energy curves and spin-orbit functions
D. Fitting procedure
IV. RESULTS AND DISCUSSION
A. Term values of the ^{39}K^{133}Cs isotopologue, empirical PECs for the *A* ^{1}Σ^{+} and states, and morphed spin-orbit functions
B. Term values of the ^{41}K^{133}Cs isotopologue
C. Intensity distribution in (4)^{1}Σ^{+} → *A* − *b* LIF progressions
D. Probabilities of the double forbidden (1)^{3}Δ ← *X* ^{1}Σ^{+} transition
E. The Ω = 0 doubling of the *b* ^{3}Π state
V. CONCLUDING REMARKS

/content/aip/journal/jcp/139/24/10.1063/1.4844275

http://aip.metastore.ingenta.com/content/aip/journal/jcp/139/24/10.1063/1.4844275

Article metrics loading...

/content/aip/journal/jcp/139/24/10.1063/1.4844275

2013-12-23

2016-10-01

Full text loading...

###
Most read this month

Article

content/aip/journal/jcp

Journal

5

3

Commenting has been disabled for this content