Conformation-Selective Resonant Photoelectron Spectroscopy via Dipole-Bound States of Cold Anions

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• 作者：Dao-Ling Huang ; Hong-Tao Liu ; Chuan-Gang Ning ; Lai-Sheng Wang
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：June 18, 2015
• 年：2015
• 卷：6
• 期：12
• 页码：2153-2157
• 全文大小：262K
• ISSN：1948-7185

文摘

Molecular conformation is important in chemistry and biochemistry. Conformers connected by low energy barriers can only be observed at low temperatures and are difficult to be separated. Here we report a new method to obtain conformation-selective spectroscopic information about dipolar molecular radicals via dipole-bound excited states of the corresponding anions cooled in a cryogenic ion trap. We observed two conformers of cold 3-hydroxyphenoxide anions [m-HO(C₆H₄)O^{鈥?/sup>] in high-resolution photoelectron spectroscopy and measured different electron affinities, 18鈥?50(8) and 18鈥?17(5) cm鈥?, for the syn and anti 3-hydroxyphenoxy radicals, respectively. We also observed dipole-bound excited states for m-HO(C₆H₄)O鈥?/sup> with different binding energies for the two conformers due to the different dipole moments of the corresponding 3-hydroxyphenoxy radicals. Excitations to selected vibrational levels of the dipole-bound states result in conformation-selective photoelectron spectra. This method should be applicable to conformation-selective spectroscopic studies of any anions with dipolar neutral cores.}