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Unravelling Complex Spectra of a Simple Molecule: REMPI Study of the 420 nm Band System of KRb
Author(s) -
Lee Yonghoon,
Yoon Youngjee,
Kim JinTae,
Lee Sungyul,
Kim Bongsoo
Publication year - 2011
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000989
Subject(s) - singlet state , chemistry , ab initio quantum chemistry methods , spectral line , ab initio , excited state , molecular electronic transition , molecule , ionization , molecular physics , atomic electron transition , atomic physics , physics , ion , organic chemistry , astronomy
Complex spectra of the KRb 420 nm system are analyzed by mass‐resolved resonance enhanced two‐photon ionization in a cold molecular beam. Vibronic structures of three singlet–singlet (4 1 Π, 7 1 Σ + , and 5 1 Π← X 1 Σ + ) transitions were identified for the first time. By comparing with highly accurate ab initio calculations, we assigned the singlet excited electronic states, and determined their electronic term values and vibrational constants. Weak singlet–triplet transitions were observed and identified as the 5 3 Π (0 + )←X 1 Σ + transitions by the homogeneous perturbation selection rule.