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The pulsed laser and gated detection in Raman spectroscopy – a survey of the spectra of common substances including studies of adsorbed benzene
Author(s) -
Yaney Perry Pappas
Publication year - 1976
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250050304
Subject(s) - raman spectroscopy , analytical chemistry (journal) , laser , chemistry , spectroscopy , materials science , optics , physics , chromatography , quantum mechanics
A pulsed‐laser Raman spectroscopy system using a doubled Nd: YAG laser is described. Comparisons between spectra recorded using the repetitive mode (low peak power and high duty cycle) with those recorded using the burst mode (high peak power and low duty cycle) are presented showing the degree of discrimination against fluorescence and stray ambient light obtained with a gated detection system. Spectra of nylon, acrylic, benzene with acridine orange, doped SrF 2 crystal, and various forms of aluminum oxide and hydroxide are presented. The spectra suggest that the burst mode consistently gives, in all cases, at least a slightly improved Raman‐signal‐to‐noise ratio with some cases showing specular improvement. The results of a preliminary analysis of the Raman spectra of benzene liquid and vapor adsorbed on aluminum oxide/hydroxide powder using the gated burst mode are also presented. Although these spectra were found to differ from that of the liquid, some tentative line identities are offered.