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- W2059095374 abstract "The IR spectra of the molecular contaminants on surface of optical materials were measured. The optical disks used were SiO 2 , BK7 ( SiO 2 70%, B 2 O 3 10%, K 2 O 8%, N 2 O 8%), CaF 2 , ZnSe and Al 2 O 3 . N 2 , O 2 , H 2 O , and CO 2 were adopted as contamination gases. IR spectra of H 2 O (2.7kPa) on BK7 at 373K showed two absorption bands ( OH stretching vibration: around 4000cm -1 -3500cm -1 and OH bending vibration: around 2000cm -1 -1500cm -1 ). The absorption intensity decreased with a decrease in temperature and a new band (around 3250cm -1 ) appeared at 173K. The new band was attributed to phase transition of H 2 O . These phenomena were also observed on the other three discs, except for SiO 2 . IR spectra of SiO 2 showed OH stretching band (3676cm -1 ). The absorption intensity decreased with a decrease in temperature. But two new bands (3720cm -1 and 3620cm -1 ) appeared under an atmosphere of N 2 (66.5kPa), O 2 (66.5kPa), H 2 O (2.7kPa) or CO 2 (0.7 or 13.3kPa). A similar phenomenon was also observed for BK7, which has OH group. These results suggested the functional group of SiOH interacted with contamination molecules." @default.
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- W2059095374 date "2006-10-30" @default.
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- W2059095374 title "FTIR STUDY ON MOLECULAR CONTAMINATION ON SURFACE OF OPTICAL MATERIALS" @default.
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- W2059095374 doi "https://doi.org/10.1142/s0217979206040490" @default.
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