Electronic absorption spectrum of HC₇O⁺

Infrared spectroscopic and theoretical study of the HC2n+1O+ (n = 2–5) cations

“…The HC 7 O + cation was produced from 1,2,3,4,5benzenepentacarboxylic acid in an ion source and has been studied recently by vibrationally resolved electronic absorption spectroscopy after mass-selected deposition in the 6 K neon matrix. 36 The observed spectrum is consistent with the linear structure, which was predicted to be the global minimum structure. 36 As shown in Fig.…”

“…36 The observed spectrum is consistent with the linear structure, which was predicted to be the global minimum structure. 36 As shown in Fig. 3, the HC 2n+1 O + cations are predicted to have polyyne-like carbon chain structures with alternating long and short C− −C bond lengths.…”

“…The cation was determined to have a singlet electronic ground state with a linear structure. 36 In this paper, the carbon chain cation derivatives with the odd number of carbon atoms, HC 2n+1 O + with n = 2-5, are produced via pulsed laser vaporization of a graphite target in supersonic expansions containing carbon monoxide and hydrogen. These cations are investigated via mass-selected infrared photodissociation spectroscopy as well as theoretical calculations.…”

On the possible contribution of cationic oxygenated carbon chains CnO+, HCnO+, and OCnO+ (n = 4–9) to the diffuse interstellar bands

“…Naturally, diffuse interstellar regions are not optimal media for molecular growth through ionneutral reactions in virtue of their quasi-collisionless conditions and high flux of UV photons and cosmic rays. Nevertheless, formation of HC 𝑛 O + could be envisaged by insertion of O + into C 𝑛 H, or the reaction between C 𝑛−1 H and CO + (Chakraborty et al 2016). Alternatively, the charge could be carried by carbon chains such as C + 𝑛 , which react with O to give C 𝑛 O + or C 𝑛 H + with CO, ultimately forming HC 𝑛+1 O + (Bohme et al 1987;Blanksby & Bowie 1999).Some of these ion-molecule reactions have been recently tested but failed to explain the observed abundances of O-bearing molecules in TMC-1.…”

Descendant of the X-ogen carrier and a "mass of 69": Infrared action spectroscopic detection of HC$_3$O$^+$ and HC$_3$S$^+$

“…The acetyl cation, CH 3 CO + , for example, has been studied in a free-jet expansion source by infrared (IR) photodissociation of its van der Waals complex CH 3 CO + −Ar [24]. An electronic spectrum of HC 7 O + in the gas-phase and trapped in an inert gas matrix has also been obtained [25]. Very recently, IR photodissociation spectra of HC n O + −CO complexes (n = 5−12) have been reported in the 1600 to 3500 cm -1 region [26,27].…”