PMID: 11345251May 10, 2001Paper

Laboratory spectra of cold gas phase polycyclic aromatic hydrocarbon cations, and their possible relation to the diffuse interstellar bands

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
P BréchignacN Boudin

Abstract

A novel laboratory technique is described, combining the use of supersonic expansion, laser excitation and small aromatic-rare gas van der Waals (vdW) clusters properties, which was developed to access the electronic absorption spectra of the polycyclic aromatic hydrocarbon (PAH) cations in the visible. It consists in preparing vdW complexes of the PAH molecule with a rare gas in a molecular beam, to photoionize it by resonant selective two-photon ionization, then to photodissociate this ionic complex by means of a delayed laser pulse in a time-of-flight mass spectrometer. The method is illustrated by presenting the visible spectra of the Naphthalene, Phenanthrene, Fluorene and Phenylacetylene cations. Such spectra can be unambiguously compared to the astronomical spectra of reddened stars, which exhibit the so-called diffuse interstellar bands (DIBs) in absorption. An interesting feature of the technique is its ability to measure the absolute absorption cross-sections. The large values of the oscillator strengths of the transitions, which are derived, are discussed in the astrophysical context which consists in considering that the PAH cations could be carriers for some of the DIBs.

Citations

Aug 10, 2013·The Journal of Chemical Physics·A J WalshM W D Mansfield
Jan 21, 2014·The Journal of Chemical Physics·Géraldine FéraudChristophe Jouvet
Dec 5, 2012·The Journal of Chemical Physics·Viktoras DryzaEvan J Bieske
Jul 6, 2014·The Journal of Chemical Physics·Colin HarthcockWei Kong
Jul 2, 2015·The Journal of Physical Chemistry. B·Samala Nagaprasad Reddy, S Mahapatra
Apr 2, 2009·The Journal of Chemical Physics·V Sivaranjana Reddy, S Mahapatra
Oct 3, 2019·Physical Chemistry Chemical Physics : PCCP·Abhishek KumarRudraditya Sarkar
Dec 7, 2007·The Journal of Physical Chemistry. a·T PinoPh Bréchignac
Oct 27, 2010·The Journal of Physical Chemistry. B·Franco CataldoPaolo Milani
Aug 4, 2010·The Journal of Physical Chemistry. a·Jie ZhangWei Kong

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