Journal
APPLIED SPECTROSCOPY
Volume 55, Issue 3, Pages 292-297Publisher
SOC APPLIED SPECTROSCOPY
DOI: 10.1366/0003702011951911
Keywords
emission spectroscopy; glow discharges; depth profile
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We have studied the effect of optical interference on element profiles obtained with a glow discharge optical emission spectrometer (GDS), The specimens were borophosphosilicate glass films deposited on polished silicon wafers. We found that in some cases the interference is accompanied with a beat in the profile: a damping of the sinusoidal wave followed by a recovery. Profilometry showed that the depth resolution is better when the interference continues continuously without a beat. We showed by simulation that the cause of the beat came from variation of the penetration rate throughout the sputtered area.
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