Optical transmission spectra of vacuum deposited amorphous boron films are obtained, at room temperature, in the near infrared over the range 700 to 4000 cm-' (14 to 2.5 pm). Absorption bands are observed and identified as due to hydrogen and carbon which are deliberately introduced into the films during deposition. The concentrations of hydrogen and carbon present in each film are determined by secondary-ion mass-spectrometry analysis. Intensities of I R bands attributed to hydrogen and carbon are found to correlate with hydrogen and carbon content, respectively.On a Btudie dans l'infrarouge proche entre 700 it 4000 cm-I (14 it 2,5 pm), le spectre optique de transmission B temperature ambiente, pour couches minces du bore amorphe obtenu sous vide. Les bandes d'absorption dues B I'hydroghe et au carbone introduit expressbment dans les Bchantillons au cours de la deposition ont 6th observees et identifiees. La concentration de I'hydroghne et du carbone dans chaque Bchantillon a bt6 determine par spectrombtrie de masse des ions secondaires. On a trouve une correlation entre les intensites des bandes infrarouges attribuees a l'hydrog h e et au carbone et les concentrations respective5 de I'hydrogAne et du carbone.
This paper reports previously unpublished results which were obtained in 1966. We systematically investigated the dependence of cluster ion intensities on the bombarding gases He+, Ar+ and Xe' (energies: 4 to 12 keV, current densities: 100 mA/cm2 ). Frequently, the observed structures in the relative cluster intensities were quite puzzling, e.g. for A1 and Si. Attempts to correlate these structures to crystal configurations failed, nor did any pattern develop from simple valency considerations alone. Initial ion energy distribution measurements from 0 to 1200 eV showed significant differences for atomic ions and cluster ions. This effect is used to reduce interference problems caused by cluster ion peaks in SIMS applied to trace analysis of solids. The results are discussed and compared with those of other investigators, also including cluster formation by vaporization and sparking. Extending known theoretical considerations may possibly afford a general understanding of the intensity structure. The formation and ejection mechanisms of clusters, however, remain unknown. Thermal effects to explain the latter are definitely discounted by the magnitude of the observed initial cluster energy (> 10 eV). Also discussed are two phenomena which demonstrate the presence of the bombarding gas in the surface.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.