Microwave spectroscopic study of the SiF radical |
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Authors: | Mitsutoshi Tanimoto Shuji Saito Yasuki Endo Eizi Hirota |
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Institution: | Sagami Chemical Research Center, Nishi-Ohnuma 4-4-1, Sagamihara, Kanagawa 229, Japan;Institute for Molecular Science, Okazaki 444, Japan |
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Abstract: | The microwave spectrum of the SiF radical was observed in both and of the ground vibronic state. The SiF radical was produced by a dc discharge either in a mixture or in a transient molecule SiF2 generated by the reaction of SiF4 with heated solid silicon. The latter gave twice as intense a spectrum. A least-squares fit to the observed spectrum showed the rotational constant and the centrifugal distortion constant to be 17 350.2752(63) and 0.03188(13) MHz, respectively, with three standard errors in parentheses applying to the last digits of the constants. The lambda-doubling parameter p0 was found to be negative, ?87.67 MHz, indicating that the 2Σ+ excited state contributions dominate over those of 2Σ?. All four hyperfine coupling constants a, b, c, and d were determined and were employed to discuss the unpaired-electron spin and orbital distributions in the SiF radical. |
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