Spectroscopic Investigation of the Electronic Structure of YN: The X1Σ+ Ground State and the New B1, C1 and D1 Excited Electronic States

✍ Scribed by Zygmunt J. Jakubek; S.G. Nakhate; Benoit Simard

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 162 KB
• Volume: 211
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2001.8483

✦ Synopsis

YN molecules were produced in a free jet molecular beam apparatus by a laser vaporizing yttrium metal in the presence of He doped with NH 3 . Laser excitation spectra were observed in the range 18 250-19 850 cm -1 . The ground state was confirmed to have 1 + symmetry. The fundamental vibration in the ground state was measured to be 650.6(1) cm -1 . Three new electronic states, B1, C1, and D1, were observed at 18 974.7(1), 19 023.3(1), and 19 824.0(1) cm -1 , respectively. The fundamental vibrations and equilibrium internuclear distances were found to be 718.3(1) cm -1 and 1.939(8) for the B1 state and 723.5(1) cm -1 and 1.9194(3) for the C1 state. Two additional electronic states were identified with the help of a deperturbation procedure, one of which is either the 1 + or the 3 - 0 state. The newly observed electronic states cannot be accounted for based on the existing ab initio results. We expect that these states correlate with the excited asymptote Y(4d 1 5s 2 2 D) + N( 2 D).