Electron spectroscopy for chemical analysis (ESCA) is proving to be a most valuable technique for the analytical chemist and molecular physicist. A commercially available Simpson–Kuyatt-type electron impact spectrometer for gas and vapor studies is described. High resolution electron transition spectra of gases, covering the equivalent wavelength range of x ray to infrared, are quickly and accurately obtained with this spectrometer. Ideally suited for quantitative and qualitative gas analysis, this new instrument will find extensive applications ranging from air pollution studies to molecular and atomic structural analysis.
John F. Rendina and Richard E. Grojean, "Electron Impact Spectrometer for Gas Analysis," Appl. Spectrosc. 25, 24-32 (1971)