Vibrationally resolved photoelectron spectrum of ZnBr

• Published in: Journal of molecular spectroscopy Vol. 357; pp. 38 - 40
• Main Authors: Mason, Jarrett L., Ewigleben, Joshua C., Jarrold, Caroline Chick
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.03.2019
• Subjects: Anion photoelectron spectroscopy; Vibrational spacings; Zinc bromide radical; Zinc. halides; Zinc bromide radical; Vibrational spacings; Zinc. halides; Anion photoelectron spectroscopy
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1016/j.jms.2019.02.003

[Display omitted] •Anion photoelectron spectrum of ZnBr− exhibits extended 280 ± 5 cm−1 neutral 2∑+vibrational progression.•ZnBr−1∑+ vibrational frequency is 120 ± cm−1.•ZnBr− bond dissociation energy is approximately 0.9 eV below neutral ZnBr.•ZnBr is less ionic than ZnF. Determination of the vibrational frequency of the ZnBr radical has been elusive, having previously been reported as 220 cm−1 and 318 cm−1 by different investigators. Recently, Burton and Ziurys reported a rotational spectrum of ZnBr from which they were able to estimate a harmonic frequency of 284 cm−1 and an anharmonicity of 1.0 cm−1. In this communication, we report a direct measurement of the vibrational spacing of ZnBr by anion photoelectron spectroscopy of ZnBr−. We determine the neutral vibrational frequency to be 280 ± 5 cm−1 (ωexe = 1.5 ± 0.5 cm−1) and the anion vibrational frequency to be 120 ± 10 cm−1. In addition, we measure the electron affinity of the neutral radical to be 2.45 ± 0.06 eV, and determine that the bond dissociation energy of the anion is lower than that of the neutral by 0.91 ± 0.06 eV.