The Dalby System of Iodine Revisited: Rotationally Resolved (2 + 1) REMPI Spectra of the Rydberg State [2Π1/2]c6s;1g of I2

✍ Scribed by A. Kvaran; H.S. Wang; J. Asgeirsson

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 772 KB
• Volume: 163
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1046

✦ Synopsis

Partly rotationally resolved ((2+1)) resonance-enhanced multiphoton ionization spectra of the vibrational bands in the Dalby system (\left(\left[{ }^{2} \mathrm{II}{1 / 2}\right]{c} 6 s ; \mathrm{g} \leftarrow X\right)) of (\mathrm{I}{2}(\mathrm{~g})) have been recorded and analyzed at room temperature. The simulation technique used in spectral analyses is described and discussed. A statistical weight ratio of odd total nuclear spin: even total nuclear spin (=7.5) is clearly seen from the same relative intensities for rotational lines corresponding to odd (J^{\prime \prime}) :even (J^{\prime \prime}) transitions. Rotational constants ( (B{v^{\prime}}) and (D_{v^{\prime}}) ) and corresponding internuclear distances (\left(r_{v}\right.) ) for the Rydberg state ( (\left[{ }^{2} \mathrm{II}{1 / 2}\right]{6} 6 s ; 1 \mathrm{~g}) ) are obtained, as well as the characteristic rotational parameters (B_{\mathrm{c}}^{\prime}=0.04036 \pm 0.00001 \mathrm{~cm}^{-1}, \alpha_{\mathrm{e}}^{\prime}=(1.12 \pm 0.02) \times 10^{-4} \mathrm{~cm}^{-1}), and (r_{\mathrm{c}}^{\prime}=2.5656 \pm 0.0005 \AA). Vibrational analyses based on determination of band origins from the spectral simulations were performed to obtain (\omega_{\mathrm{c}}=241.8 \pm 0.5 \mathrm{~cm}^{-1}) and (\omega_{\mathrm{e}} x_{\mathrm{e}}=0.64 \pm 0.07 \mathrm{~cm}^{-1}), in good agreement with earlier results by Dalby et al. (Can. J. Phys. 55, 1033-1046, 1977). (C) 1994 Academic Press, Inc.