VIB-ROTATIONAL ANALYSIS ON $2\nu_{1} + \nu_{5}, \nu_{1} + \nu_{2} + 3\nu_{5}$, and $2\nu_{2} + 5\nu_{5}$ COMBINATION BANDS OF ACETYLENE USING A GaAs SEMICONDUCTOR LASER

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 Title: VIB-ROTATIONAL ANALYSIS ON $2\nu_{1} + \nu_{5}, \nu_{1} + \nu_{2} + 3\nu_{5}$, and $2\nu_{2} + 5\nu_{5}$ COMBINATION BANDS OF ACETYLENE USING A GaAs SEMICONDUCTOR LASER Creators: Suzuki, M.; Yamashita, T.; Ohtsuka, T.; Yukiya, T.; Nishimiya, N. Issue Date: 1998 Abstract: The vib-rotational spectrum of the $2\nu_{1}+\nu^{i=1}_{5}, \nu_{1}+\nu_{2}+3\nu_{5}^{i=1}$ and $2\nu_{2}+5\nu_{5}^{i=1}$ combination bands of acetylene was measured using a GaAs semiconductor laser (New Focus 6148) at the wavenumber region from 7400 to $7600 cm^{-1}$ and the P-, R- and Q-branches were assigned. The wavenumber measuring system with a wavelength meter (Anritsu MF9630A) and a confocal interferometer of 15 cm was calibrated against the $H_{2}O lines.^{1}$ The formulation describing the spectral line positions by a third order polynomial of $J(J+1)$ with the effective spectroscopic parameters of $\nu_{0}^{eff},B_{\nu}^{eff}$, and $H_{\nu}^{eff}$ was obtained using second order perturbation theory to take the l-type resonance effect into consideration. The spectroscopic constants and the l-type doubling constants were calculated from the effective rotational parameters determined using a least squares fitting procedure for the e- and f-levels by the aid of the molecular constants reported by ref. 2 and 3. URI: http://hdl.handle.net/1811/18924 Other Identifiers: 1998-RF-11