# Optical Absorptions of Oxygenated Carbon Chain Cations in the Gas Phase

Rice, C. A. and Chakraborty, A. and Fulara, J. and Maier, J. P.. (2016) Optical Absorptions of Oxygenated Carbon Chain Cations in the Gas Phase. The Astrophysical Journal, 824 (1). p. 9.

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The gas-phase electronic spectra of linear OC4O+ and a planar C6H2O+ isomer were obtained at a rotational temperature of ≈10 K. Absorption measurements in a 6 K neon matrix were followed by gas-phase observations in a cryogenic radiofrequency ion trap. The origin bands of the $1{}^{2}{{\rm{\Pi }}}_{u}\;\leftarrow \;X{}^{2}{{\rm{\Pi }}}_{g}$ transition of OC4O+ and the $1{}^{2}$A${}_{2}\;\leftarrow X{}^{2}$B1 of HCCC(CO)CCH+ lie at 417.31 ± 0.01 nm and 523.49 ± 0.01 nm, respectively. These constitute the first electronic spectra of oxygenated carbon chain cations studied under conditions that are relevant to the diffuse interstellar bands (DIBs), as both have a visible transition. The recent analysis of the 579.5 nm DIB indicates that small carriers, five to seven heavy atoms, continue to be possible candidates (Huang & Oka 2015). Astronomical implications are discussed regarding this kind of oxygenated molecules.