2010A&A...517A..15A

2010A&A...517A..15A - Astronomy and Astrophysics, volume 517A15-15 (2010/7-1)

Gas-phase infrared spectra of cationized nitrogen-substituted polycyclic aromatic hydrocarbons.

Gas-phase infrared spectra of several ionized nitrogen substituted polycyclic aromatic hydrocarbons (PANHs) have been recorded in the 600-1600cm^–1 region via IR multiple-photon dissociation (IRMPD) spectroscopy. The UV photoionized PANH ions are trapped and isolated in a quadrupole ion trap where they are irradiated with an IR free electron laser. The PANHs were studied in their radical cation (PANH⁺) and protonated (H⁺PANH) forms, and include quinoline, isoquinoline, phenanthridine, benzo[h]quinoline, acridine, and dibenzo[f,h]quinoline. Experimental IRMPD spectra were interpreted with the aid of density functional theory methods. The PANH⁺ IR spectra are found to resemble those of their respective non-nitrogenated PAH cations. The IR spectra of H⁺PANHs are significantly different owing to the NH inplane bending vibration, which generally couples very well with the aromatic CH bending and CC stretching modes. Implications of the NPAH (+, H⁺) laboratory spectra are discussed for the astrophysical IR emissions and, in particular, for the band at 6.2µm.

Journal keyword(s): astrochemistry - methods: laboratory - techniques: spectroscopic - ISM: molecules - molecular processes

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	SH 2-159	Y*O	23 15 31.2384366062	+61 07 10.181362705						~	188	1

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`2MASS J23153120+6107110`	`JCMTSF J231531.3+610713`	`WISEA J231531.33+610709.4`	`[LRL2001] G111.61+0.37`
`AKARI-FIS-V1 J2315292+610722`	`KR 77A`	`WISE J231531.36+610708.9`	`[LRL2001] 10`
`AKARI-IRC-V1 J2315313+610713`	`LBN 543`	`WN B2313.3+6051B`	`[MO2001] 82`
`BGPS G111.615+00.374`	`LBN 111.67+00.33`	`[BNM96] 111.612+0.373`	`[SFA2014] Cloud S159`
`BGPSv2 G111.609+00.376`	`2MASX J23153127+6107104`	`[ERG2015] 7872`	`[SSS2011] BGPS G111.615+0.374`
`F3R 3433`	`MSX6C G111.6115+00.3735`	`[GSL2002] 112`	`[THW2006] G111.612+00.374SMM`
`GAL 111.62+00.37`	`NVSS J231531+610709`	`[HLB98] Onsala 182`	`[THW2006] G111.61+00.37`
`GPSR 111.612+0.374`	`RAFGL 3053`	`[KC97c] G111.6+00.4`	`[WWB83] G111.62+0.37`
`IRAS 23133+6050`	`SH 2-159`	`[KCW94] 111.612+00.374`	`Gaia DR3 2014172746510194304`
`IRCO 1162`	`TIC 377898083`	`[KCW94] 111.61+00.37`
`JCMTSE J231531.3+610713`	`WB89 261`	`[L89b] 111.612+00.374`

`2MASS J23153120+6107110`	`AKARI-FIS-V1 J2315292+610722`	`AKARI-IRC-V1 J2315313+610713`	`F3R 3433`	`IRAS 23133+6050`
`2MASX J23153127+6107104`	`MSX6C G111.6115+00.3735`	`NVSS J231531+610709`	`RAFGL 3053`	`WISEA J231531.33+610709.4`
`WISE J231531.36+610708.9`	`WN B2313.3+6051B`	`Gaia DR3 2014172746510194304`