Perturbation-facilitated detection of the first quintet-quintet band in C2

• DOI: 10.1063/1.4913925
• Publication Date: 2015-03-07T01:30:15Z
• Authors: P. Bornhauser; R. Marquardt; C. Gourlaouen; G. Knopp; M. Beck; T. Gerber; J. A. van Bokhoven; P. P. Radi
• Keywords: Molecular beam

The first high-spin transition in C2 (1 (5)Πu - 1 (5)Πg) is observed by perturbation-facilitated optical-optical double resonance spectroscopy. experiment performed applying unfolded two-color resonant four-wave mixing. radicals the initial a (3)Πu, v = 5 state are produced using discharge source molecular beam environment. final quintet excited via intermediate "gateway" states exhibiting both substantial triplet and character due to perturbation between (5)Πg, 0 d (3)Πg, 6 states. Fifty seven rotational transitions P, Q, R branches of all spin sub-states measured yield accurate constants newly found upper level (5)Πu. In addition, satellite (ΔJ ≠ ΔN) allow an determination spin-orbit constant. results compared with high-level ab initio computations at multi-reference configuration interaction theory. high-lying be predissociative displays shallow potential that accommodates three vibrational levels only.