Velocity Map Imaging Spectroscopy of the Dipole-Bound State of CH2CN-: Implications for the Diffuse Interstellar Bands

Benjamin A. Laws*, Zachariah D. Levey, Timothy W. Schmidt, Stephen T. Gibson

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Weakly bound anionic systems present a new domain for negative ion spectroscopy. Here we report on a multifaceted study of the CH2CN- dipole-bound state, employing high-resolution photoelectron spectroscopy from 130 different wavelengths, velocity-map imaging at threshold, and laser scanning photodetachment experiments. This uncovers a wide variety of different vibrational and rotational autodetaching resonances. By examination of both sides of the problem, absorption from the anion to the dipole-bound state and vibrational/rotational autodetachment to the neutral, a complete model of the dipole-bound chemistry is formed. Precise values for the electron affinity EA = 12468.9(1) cm-1, dipole binding energy DBE = 40.2(3) cm-1, and anion inversion splitting ω5 = 115.9(2) cm-1 are obtained. This model is then employed to study possible astronomical implications, revealing good agreement between the K = 1 ← 0 CH2CN- dipole transition and the λ8040 diffuse interstellar band.

    Original languageEnglish
    Pages (from-to)18684-18692
    Number of pages9
    JournalJournal of the American Chemical Society
    Volume143
    Issue number44
    DOIs
    Publication statusPublished - 10 Nov 2021

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