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Development of photoacoustic spectrometry for measurement of isotope ratio.

开发用于测量同位素比的光声光谱法。

基本信息

批准号：
10358014
负责人：
KAWASAKI Masahiro
金额：
$ 17.54万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10358014/
关键词：
water third overtone pulsed lasar photoacoustic isotope PAS microphone fourth overtone

项目摘要

A photoacoustic spectroscopy technique is applied to the isotope ratio measurement of ィイD116ィエD1O and ィイD118ィエD1O in water-vapor samples, using a pulsed tunable dye laser pumped by Nd : YAG laser. The third overtone band (3vィイD2OHィエD2) of water molecules near 950 nm was investigated, for two standard water samples, V-SMOW and SLAP. We identified the absorption lines of HィイD22ィエD2ィイD116ィエD1O and HィイD22ィエD2ィイD118ィエD1O in the photoacoustic spectra that we measured by using the HITRAN database. We measured the difference in the ィイD118ィエD1O/ィイD116ィエD1O isotope ratios for V-SMOW and SLAP, using the photoacoustic method. For each water isotope (HィイD22ィエD2ィイD116ィエD1O and HィイD22ィエD2ィイD118ィエD1O) peak we made 128 times averaging of the photoacoustic wave on the oscilloscope and scanned the laser wavelength within a selected range in 0.002 nm increments. The measurement time was 7000 s for each sample. The value obtained for the difference between the two samples is δィイD118ィエD1OィイD2SMOWィエD2=-55±10‰, whereas the value measured with a conventional isotope mass spectrometer is δィイD118ィエD1O=-55.5‰. That δ-value was certainly an improvement on the previous work. However, the obtained δ-value has a relatively large deviation, because the deviation should be less than 1-2‰ for practical use. Further improvements are necessary to reduce the deviation. The large deviation comes mainly from the low signal-to-noise ratio in the photoacoustic spectra.

光声光谱技术应用于同位素比值测量ィイD116ィエD1O和ィイD118ィエD1O在水蒸气样本,使用脉冲可调谐染料激光器泵浦的Nd: YAG激光。以V-SMOW和SLAP两种标准水样为样本，研究了水分子在950 nm附近的第三个泛音波段（3v刷刷刷D2OH刷刷刷D2）。在利用HITRAN数据库测量的光声光谱中，我们确定了H′′γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。我们利用光声方法测量了V-SMOW和SLAP的γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。对于每个水同位素(HィイD22摊位ィエD2ィイD116ィエD1O和HィイD22摊位ィエD2ィイD118ィエD1O)我们做了128次的平均峰值光声波示波器和扫描激光波长在0.002 nm的增量在选定的范围内。每个样品的测量时间为7000 s。价值获得了两个样品之间的差异是δィイD118ィエD1OィイD2SMOWィエD2 = -55±10‰,而用传统的同位素质谱计是测量值δィイD118ィエD1O = -55.5‰。这个δ值肯定是对先前工作的改进。但得到的δ值偏差较大，实际应用时偏差应小于1-2‰。进一步的改进是必要的，以减少偏差。较大的偏差主要来自于光声光谱的低信噪比。