Abstract

This work describes a fast and reliable method for determination of photoionization cross-sections (PICS) by means of gas chromatography (GC) coupled to single-photon ionization mass spectrometry (SPI-MS). Photoionization efficiency (PIE) data for 69 substances was obtained at a photon energy of 9.8 ± 0.4 eV using an innovative electron-beam-pumped rare gas excimer light source (EBEL) filled with argon. The investigated analytes comprise 12 alkylbenzenes as well as 11 other substituted benzenes, 23 <i>n</i>-alkanes, ten polyaromatic hydrocarbons, seven aromatic heterocycles, and six polyaromatic heterocycles. Absolute PICS for each substance at 9.8 eV are calculated from the relative photoionization efficiencies of the compounds with respect to benzene, whose photoionization cross-section data is well known. Furthermore, a direct correlation between the type of benzene substituents and their absolute PICS is presented and discussed in depth. Finally, comparison of previously measured photoionization cross-sections for 20 substances shows good agreement with the data of the present work.

Single-photon laser ionization time-of-flight mass spectroscopy detection in molecular-beam epitaxy: application to As₄, As₂, and Ga

Paul G. Strupp, April L. Alstrin, Russell V. Smilgys, and Stephen R. Leone
Appl. Opt. 32(6) 842-846 (1993)

Molecular analysis by ionization of laser-desorbed neutral species

Keith R. Lykke, Peter Wurz, Deborah H. Parker, and Michael J. Pellin
Appl. Opt. 32(6) 857-866 (1993)

Absolute two-photon ionization yields for selected organic molecules at 248 nm

William K. Bischel, Leonard J. Jusinski, Mark N. Spencer, and Donald J. Eckstrom
J. Opt. Soc. Am. B 2(6) 877-885 (1985)

Prospects for photoionization studies of weakly bound molecular complexes using free-electron-laser vacuum-ultraviolet radiation

E. A. Walters and J. R. Grover
J. Opt. Soc. Am. B 6(5) 1072-1074 (1989)

Experimental and theoretical analysis of resonant multiphoton ionization of benzene

M. Armenante, R. Bruzzese, A. Passarelli, N. Spinelli, S. Solimeno, and F. Vanoli
J. Opt. Soc. Am. B 2(7) 1088-1094 (1985)