Cryogenic Photodetachment Spectroscopy and High-Resolution Resonant Photoelectron Imaging of Cold para-Ethylphenolate Anions
作者机构：Department of ChemistryBrown UniversityProvidenceRhode Island 02912United States
出 版 物：《Precision Chemistry》 (精准化学（英文）)
年 卷 期：2023年第1卷第3期
页 面：161-174页
学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学]
基 金：supported by the Department of Energy Office of Basic Energy Sciences Chemical Sciences Geosciences and Biosciences Division under Grant DE-SC0018679
主 题：dipole-bound state photoelectron imaging cryogenic ion cooling resonant photoelectron spectroscopy ethylphenoxy radical vibrational frequencies electrospray ionization
摘 要：Valence-bound molecular anions with polar neutral cores(μ2.5 D)can support highly diffuse dipole-bound states(DBSs)as electronically excited states just below the detachment *** weakly bound nonvalence excited states have little influence on the structure of the neutral core,and they usually have the same vibrational *** can be systematically searched using photodetachment spectroscopy(PDS),which can yield the binding energies of the DBSs,the electron detachment threshold of the anion,and above-threshold vibrational levels of the DBSs(Feshbach resonances).We have shown that the combination of PDS and resonant photoelectron spectroscopy(rPES)at the Feshbach resonances is a powerful approach to obtain rich vibrational information for complex molecular radicals.A prerequisite for this technique is to produce vibrationally cold anions,made possible by a cryogenically controlled Paul *** this article,we report a PDS and rPES study of cold para-ethylphenolate anions(p-EP^(-)).The electron affinity of the p-EP radical is measured to be 17425±3 cm^(-1)(2.1604±0.0004 eV),and a DBS is found at 145 cm^(-1) below the detachment threshold of p-EP^(-).Thirty-four vibrational levels are observed for the DBS,including two bound levels and 32 Feshbach *** for 17 vibrational modes of the p-EP radical are measured from the combination of PDS and rPES,including six symmetry-forbidden modes with A″*** current study confirms again the power of combining cryogenic ion cooling with PDS and highresolution rPES to obtain spectroscopic information on complex molecular radicals.
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