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The a 3Σ+1(u) ← X 1Σ+(g) band systems of CuAu and Au2

✍ Scribed by Gregory A. Bishea; Michael D. Morse

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
254 KB
Volume
171
Category
Article
ISSN
0009-2614

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✦ Synopsis

Thea%* , ("r tX 'Et, band systems ofjet-cooled CuAu and AU* have been spectroscopically observed by resonant twephoton ionization spectroscopy. The upper state vibrational constants (w: = 109.3 cm-', w:x: =0.90 cm-r for 63C~'97A~; w: = 82.9 cm-', o&r& = 1.01 cm-' for "'AUK) indicate shallow excited potential curves, and the long excited state lifetimes ( FZ 40 us for Au*, > 90 us for CuAu) imply a spin-forbidden decay process, in agreement with the assignment of the transition. Birge-Sponer extrapolations give ground state bond strengths of2.41+0.07 and 2.290? 0.0 15 eV for CuAu and Au*, respectively. A rotationally resolved scan of6'Cug7Au has established the bond lengths as r,(X '2+)=2.3303 kO.

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