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题名: Raman spectroscopic investigation of solid samples using a low-repetition-rate pulsed Nd : YAG laser as the excitation source
作者: Zhang, Jing;  Feng, Zhaochi;  Li, Meijun;  Chen, Jun;  Xu, Qian;  Lian, Yuxiang;  Li, Can
关键词: low-repetition-rate pulsed laser ;  UV Raman spectroscopy ;  Raman spectroscopy ;  thermal damage
刊名: APPLIED SPECTROSCOPY
发表日期: 2007
卷: 61, 期:1, 页:38-47
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Instruments & Instrumentation ;  Spectroscopy
研究领域[WOS]: Instruments & Instrumentation ;  Spectroscopy
英文摘要: We tried to investigate the possibility of using a low-repetition-rate pulsed Nd:YAG laser as an excitation source in Raman measurements for solid samples. Based on the results from the Raman spectra excited by continuous wave (CW) 532 and 325 nm lasers, we studied the influence of laser energy and irradiation time of 532 and 355 nm pulsed Nd:YAG lasers (10 Hz repetition rate) on the thermal stability of (NH4)(6)Mo7O24 center dot 4H(2)O, NH4VO3, and Ce(NO3)(3)center dot 6H(2)O samples, which usually decompose at relatively low temperatures. It is observed that the heating temperature estimated at these samples caused by the irradiation of 532 nm pulsed laser with 22 mJ is no higher than 100 degrees C even for 60 min exposure. The 355 nm pulsed laser with energies below 8.0 mJ hardly causes thermal damage to hydrated (NH4)(6)Mo7O24 and hydrated Ce(NO3)(3) samples. However, a 355 nm pulsed laser with only 2.2 mJ causes heating temperatures as high as 200 degrees C in the NH4VO3 sample. These great differences should be attributed to the electronic absorbance of the above three samples at 355 ran. We also found that a 532 nm pulsed laser with even 22 mJ and a 355 ran pulsed laser with even 8.0 mJ do not cause the phase transition of TiO2 and ZrO2, Whose phase transformation easily takes place at elevated temperatures, but pulsed lasers could remove some oxygen atoms from these samples. In addition, for L-alanine and DL-beta-phenylalanine biological samples, it is surprisingly found that they are not damaged by the 355 nm pulsed laser even when the laser energy is increased to 8.0 mJ, possibly because they do not absorb the 355 nm laser. Based on these results, it is demonstrated that low-repetition-rate pulsed lasers with appropriate wavelength and energy can be employed as the excitation sources of Raman spectroscopy for characterizing some solid samples, even the thermally unstable samples.
关键词[WOS]: PHASE-TRANSFORMATION ;  SUPPORTED VANADIUM ;  SURFACE REGION ;  ZIRCONIA ;  CATALYSTS ;  ANATASE ;  SATURATION ;  SPECTRA ;  RUTILE
语种: 英语
WOS记录号: WOS:000243857100007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140398
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, Jing,Feng, Zhaochi,Li, Meijun,et al. Raman spectroscopic investigation of solid samples using a low-repetition-rate pulsed Nd : YAG laser as the excitation source[J]. APPLIED SPECTROSCOPY,2007,61(1):38-47.
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