Spectroscopic analysis of the coupled 11Π, 23Σ+ (Ω = 0−, 1), and b3Π (Ω = 0±, 1, 2) states of the KRb molecule using both ultracold molecules and molecular beam experiments

Jin-Tae Kim; Yonghoon Lee; Bongsoo Kim; Dajun Wang; William C. Stwalley; Phillip L. Gould; Edward E. Eyler

doi:10.1039/C1CP21207A

Spectroscopic analysis of the coupled 1¹Π, 2³Σ⁺ (Ω = 0⁻, 1), and b³Π (Ω = 0^±, 1, 2) states of the KRb molecule using both ultracold molecules and molecular beam experiments†

Jin-Tae Kim,*^a Yonghoon Lee,^b Bongsoo Kim,*^c Dajun Wang,‡^d William C. Stwalley,*^d Phillip L. Gould^d and Edward E. Eyler^d

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* Corresponding authors

^a Dept. of Photonic Engineering, Chosun University, Gwangju 501-759, Korea
E-mail: kimjt@chosun.ac.kr
Fax: +82 62 2307437
Tel: +82 62 2307019

^b Dept. of Chemistry, Mokpo National University, Jeonnam 534-729, Korea
Fax: +82 61 4502339
Tel: +82 61 4502332

^c Dept. of Chemistry, KAIST, Daejeon 305-701, Korea
E-mail: bongsoo@kaist.ac.kr
Fax: +82 42 3502810
Tel: +82 42 3502836

^d Dept. of Physics, University of Connecticut, Storrs, USA
E-mail: w.stwalley@uconn.edu
Fax: +1 860 4863346
Tel: +1 860 4864924

Abstract

We report the spectroscopic characterization of excited electronic states of KRb by combining spectra from molecular beam (MB) experiments with those from ultracold molecules (UM) formed by photoassociation (PA) of ultracold atoms. Spectra involving the 1¹Π, 2³Σ⁺, and b³Π states in a strongly perturbed region have been identified. This approach provides a powerful method to identify the vibrational levels of the excited electronic states perturbed globally by neighboring electronic states. This is because the two sets of spectra from the UM and the MB experiments probe the same energy region from very different initial electronic states. The UM experiments utilize high v′′ levels of the a³Σ⁺ state with large internuclear separations, while the MB experiments utilize low v′′ levels of the ground X¹Σ⁺ state with near-equilibrium internuclear separations. Only the Ω = 1 levels of the 2³Σ⁺ and b³Π states are observed in the MB spectra, while the Ω = 0⁻, 1 levels of the 2³Σ⁺ state and the Ω = 0^±, 1, 2 levels of the b³Π state are observed in the UM spectra.

This article is part of the themed collection: Physics and chemistry of cold molecules

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Article information

DOI: https://doi.org/10.1039/C1CP21207A
Article type: Paper
Submitted: 15 Apr 2011
Accepted: 20 Jul 2011
First published: 10 Aug 2011

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Phys. Chem. Chem. Phys., 2011,13, 18755-18761

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Spectroscopic analysis of the coupled 1¹Π, 2³Σ⁺ (Ω = 0⁻, 1), and b³Π (Ω = 0^±, 1, 2) states of the KRb molecule using both ultracold molecules and molecular beam experiments

J. Kim, Y. Lee, B. Kim, D. Wang, W. C. Stwalley, P. L. Gould and E. E. Eyler, Phys. Chem. Chem. Phys., 2011, 13, 18755 DOI: 10.1039/C1CP21207A

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