Rotationally Resolved REMPI Spectra of CaH in a Molecular Beam

Author： Pereira R. Skowronek S. Ureña A.G. Pardo A. Poyato J.M.L. Pardo A.H.

ISSN： 0022-2852

Source： Journal of Molecular Spectroscopy, Vol.212, Iss.1, 2002-03, pp. : 17-21

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Abstract

Rotationally resolved spectra of the CaH radical using a supersonic molecular beam are reported. Thus, high energy resolution of the (1+1′) REMPI spectra corresponding to the A←X and B←X electronic transitions were measured which allowed for the first time a clear and precise analysis of the low rotational part (J≤7) of the CaH spectrum. A comparison with previous studies revealed that the commonly accepted energy separation between the two band heads of B-X (v′=1, v′=0) of 10 cm^-1 is not correct. A value of ca. 1.6 cm^-1 was found to be more realistic. On the other hand, the present study confirmed that the perturbation appears only for v′=1, N′>3 of the B state. © 2002 Elsevier Science (USA).