Electronic absorption spectrum of HC₇O⁺

ABSTRACT

Vibrationally resolved electronic absorption spectrum of 1-oxohepta-2,4,6-triyn-ylium cation has been recorded in a 6 K neon matrix after mass-selected deposition of m/z = 101 cations produced from the 1,2,3,4,5-benzenepentacarboxylic acid in an ion source. The band system with origin at 278 nm is assigned to the 2¹Σ⁺ ← X¹Σ⁺ transition of the linear-HC₇O⁺ isomer on the basis of theoretical calculations. Vibrational analysis of the electronic spectrum is consistent with the structure.

KEYWORDS:

• Electronic spectrum
• mass-selection
• HC₇O⁺
• interstellar molecules
• matrix isolation

Acknowledgments

This work was supported by the Swiss National Science Foundation [project number 200020-124349/1].

Disclosure statement

No potential conflict of interest was reported by the authors.