# REANALYSIS OF THE HC1$^{+}$ A-X BAND SYSTEM

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 Title: REANALYSIS OF THE HC1$^{+}$ A-X BAND SYSTEM Creators: Saenger, Katherine L.; Zare, R. N.; Mathews, C. W. Issue Date: 1975 Publisher: Ohio State University Abstract: Using the line positions measured by Sheasley and $Mathews,^{1}$ we have reanalyzed the $A^{2}\Sigma^{+}$ - $X^{2}\Pi$ emission spectrum of $H^{35}$Cl$^{+}$, $H^{37}$C1$^{+}$, $D^{35}$C1$^{+}$ , and $D^{37}$Cl$^{+}$, employing the Hamiltonians and direct approach” described by Zare, Schmeltekopf, Harrop, and $Albritton,^{2}$ The values for the spin orbit centrifugal distortion constant, $A_{D}$, obtained in the present analysis have changed in both sign and magnitude from those obtained previously and now are approximately twice the values predicted by Veseth. The isotope ratio, $A_{D}(DC1^{+})/A_{D}(HCL^{+}$) , previously $\cong 0.23$, and theoretically $\cong$ 0.51, was found to be $\cong 0.45$, We believe the remaining discrepancy In the magnitudes of our $A_{D}$ values is caused by arbitrarily neglecting the $\Pi$ state spin-rotation constant, $\gamma$$\Pi$, and we have obtained values of this constant for several vibrational levels by fixing $A_{D}$ to values calculated from the Coxon $relation.^{3}$ The molecular constants for the $A^{2}\Sigma^{+}$ state are virtually the same as those obtained previously. Description: $^{1}$W. D. Sheasley and C W. Mathews, J. Mol. Spectrosc. 47, 420 (1973) $^{2}$ R.N. Zare, A. L. Schmeltekopf, W.J. Harrop, and D. L. Albritton, J. Mol. Spectrosc. 46, 37 (1973). $^{3}$ J.A. Coxon, The A$^{2}\Sigma^{+}$ - X$^{2}\Pi_{1}$; System of OD: Determination of Molecular Constants by the Direct Approach,"" J. Mol, Spectrosc, (submitted for publication). Author Institution: Department of Chemistry, Columbia University; Department of Chemistry, The Ohio State University URI: http://hdl.handle.net/1811/9472 Other Identifiers: 1975-TE-10