# THE $B \rightarrow X$ TRANSITION IN $^{200}HG^{79}Br$

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 Title: THE $B \rightarrow X$ TRANSITION IN $^{200}HG^{79}Br$ Creators: Ashmore, J. Gail; Tellinghuisen, Joel Issue Date: 1982 Publisher: Ohio State University Abstract: The $B \rightarrow X$ spectrum of HgBr is photographed and analyzed for the single isotopic species ${^{200}Hg}^{79}Br$. The analysis confirms Wieland's previous $analysis^{1}$ up to v""=23 but deviates significantly for highest v"". For the higher v"" level presently included in our analysis $(v""=34, {G_{v}}^{""}=4850 cm^{-1})$, the vibrational level spacings do not conform to the theoretical long-range limiting behaviour. However, as a rough upper bounds on ${\Phi_{e}}^{""}$ we obtain the value $5500 cm^{-1}$, which is $500 cm^{-1}$ lower than estimated previously using long-range $theory,^{2}$ Frank - Condon calculations indicate that ${R_{e}}^{""}-{R_{e}}^{""}=0.57 \AA$, which is greater than concluded in earlier $work,^{3}$ Preliminary results of a rotational analysis yield ${R_{e}}^{'}\approx 3.07 \AA$. The $reported^{4}$ HgBr laser lines appear not to coincide with specific band heads in the spectrum. Instead they probably involve a semicontinuous overlap of rotational lines in several v'-v"" bands of the 12 isotopic HgBr molecules of significance in natural'' HgBr. Description: $^{1}$K. Wieland, Z. Elektrochem. 64, 761 (1960). $^{2}$B. E. Wilcomb and R.B. Bernstein, J. Mol, Spectrose, 62, 442 (1976). $^{3}$N.-H. Cheung and T.A Cool, J. Quant. Spectrose, Radiat, Transfer 21, 397(1979). $^{4}$E. J. Schimitschek and J.E. Celto, Optics Lett, 2, 64 (1978). URI: http://hdl.handle.net/1811/28966 Other Identifiers: 1982-WF-5