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首页> 外文期刊>The Journal of Chemical Physics >BINDING ENERGIES OF CARBAZOLE-CENTER-DOT-S VAN DER WAALS COMPLEXES (S=N-2, CO, AND CH4)
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BINDING ENERGIES OF CARBAZOLE-CENTER-DOT-S VAN DER WAALS COMPLEXES (S=N-2, CO, AND CH4)

机译:咔唑-中心-点-S-范德华络合物(S = N-2,CO和CH4)的结合能

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摘要

Mass-selective ground-state vibronic spectra of molecular van der Waals complexes carbazole S, S=N-2, CO, and CH4, were measured by stimulated emission pumping followed by resonant two-photon ionization of the vibrationally hot complexes. S-0-state vibrational modes were accessed from approximate to 200 cm(-1) up to the ground-state dissociation limit D-0(S-0) of the van der Waals bond. Above D-0, efficient vibrational predissociation of the complexes occurs, allowing accurate determination of the van der Waals dissociation energies as 627.2+/-7.9 cm(-1) for N-2, 716.5+/-29.8 cm(-1) for CO, and 668.6+/-15.1 cm(-1) for CH4. In the S-1 excited state, the van der Waals binding energies increase to 678.5+/-8.0, 879.2+/-29.9, and 753.8+/-15.2 cm(-1), respectively. The relative increases upon electronic excitation are about 8% and 13% for N-2 and CH4, Similar to the analogous rare gases Ar and Rr. For CO, the relative increase of van der Waals binding energy is 23%. The differences are primarily due to electrostatic interactions. (C) 1995 American Institute of Physics. [References: 57]
机译:分子范德华配合物咔唑S,S = N-2,CO和CH4的质量选择性基态振动光谱通过受激发射泵浦,然后通过振动热配合物的共振双光子电离来测量。从大约200 cm(-1)到范德华键的基态解离极限D-0(S-0),可以访问S-0状态的振动模式。在D-0以上,会发生有效的复合物振动预离解,从而可以准确测定范德华离解能,其中N-2为627.2 +/- 7.9 cm(-1),N-2为716.5 +/- 29.8 cm(-1)。 CO和CH4的668.6 +/- 15.1 cm(-1)。在S-1激发态下,范德华结合能分别增加到678.5 +/- 8.0、879.2 +/- 29.9和753.8 +/- 15.2 cm(-1)。 N-2和CH4在电子激发时的相对增加分别约为8%和13%,类似于类似的稀有气体Ar和Rr。对于CO,范德华结合能的相对增加为23%。差异主要是由于静电相互作用。 (C)1995年美国物理研究所。 [参考:57]

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