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A high-resolution laser ablation study of the (A)over-tilde(2)Pi(X)over-tilde(2)Sigma(+) transition of SrCCH

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JournalJOURNAL OF MOLECULAR SPECTROSCOPY
DatePublished - Oct 2005
Issue number2
Volume233
Number of pages6
Pages (from-to)197-202
Original languageEnglish

Abstract

The laser-induced excitation spectrum of the (A) over tilde (2)Pi-(X) over tilde (2)Sigma(+) transition of SrCCH has been recorded at high resolution. A rotational analysis has been performed yielding rotational and fine structure parameters for the A state. In addition, a vibrational frequency for the Sr-C stretch (nu(3)) in the (A) over tilde (2)Pi state has been determined. Using the rotational constant of the A state, the Sr-C bond length was determined to be 2.43 angstrom, which is similar to 0.03 angstrom shorter than in the ground state. A comparison of the Lambda-doubling constant p, to those of the other alkaline-earth acetylides suggests that SrCCH and CaCCH appear to follow the pure precession model unlike MgCCH. Finally, a search for the (B) over tilde (2)Sigma(+)-(X) over tilde (2)Sigma(+) transition was negative, as with CaCCH, suggesting that the (B) over tilde state may be predissociative. (c) 2005 Elsevier Inc. All rights reserved.

    Research areas

  • SrCCH, strontium-bearing molecules, monoacetylides, laser spectroscopy, alkaline-earth metal bond, METALLIC FREE-RADICALS, C BENDING VIBRATION, AB-INITIO, (X)OVER-TILDE(2)SIGMA(+) STATES, CALCIUM MONOACETYLIDE, WAVE SPECTRUM, SPECTROSCOPY, CACCH, MGCCH, CCH

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