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OBSERVATION OF A LINEAR ISOMER OF THE C${_3}$-Xe VAN DER WAALS COMPLEX

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38340

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Title: OBSERVATION OF A LINEAR ISOMER OF THE C${_3}$-Xe VAN DER WAALS COMPLEX
Creators: Tham, Keng Seng; Chao, Jun-Mei; Zhang, Guiqiu; Merer, Anthony J.; Hsu, Yen-Chu; Hu, Wei-Ping
Issue Date: 2009
Publisher: Ohio State University
Abstract: Our emission spectra of the C${_3}$-Xe vdW (van der Waals) complex obtained near the 2$^{2-}_0$ band of the \~{A}$-$\~{X} system of C${_3}$ showed that a stable linear isomer is present at high C${_3}$-bending vibrational levels (${v_b}$ $\geq$ 4) of the ground electronic state. Ab initio calculations at the level of CCSD(T)/cc-pVTZ (effective core potential of the Xe atom) support our spectral assignments. The linear isomer lies about 250 cm $^{-1}$ above the T-shaped isomer. From the calculated potential, large amplitude vdW bending motion is expected in the high $v_b$ levels; this explains the congested emission spectra observed from vdW bands near the 2$^{4-}_0$ band of C${_3}$ . Molecular orbitals at the level of HF-SCF showed that bonding with the 5$p$ orbital of the Xe atom in a linear configuration (along the $a$-axis of C${_3}$) is stabilized by mixing some high-lying $\pi^*$ bonding character into one of the C-C bonds. This type of bonding is not possible in the Ar and Kr complexes because in these two complexes 3$p$ or 4$p$ orbitals of the rare gas atoms are used. The isomerization from the T-shaped isomer to the linear isomer probably occurs rapidly in the \~{A} state.
Description: Author Institution: Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei 10617, R. O. C.; Department of Chemistry, National Chung-Cheng University, Taiwan, R. O. C
URI: http://hdl.handle.net/1811/38340
Other Identifiers: 2009-TJ-03
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