Ultrasensitive Absorption Spectroscopy in Planetary Studies:Intracavity Laser Measurements

行星研究中的超灵敏吸收光谱：腔内激光测量

• 批准号: 9018818
• 负责人: George Atkinson
• 金额: $ 38.32万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9018818&HistoricalAwards=false
• 关键词: Ultrasensitive; Absorption; Spectroscopy; Planetary; Studies

Drs. Atkinson, Hunten, and Lunine at the University of Arizona will use a broadly applicable laboratory spectroscopy technique to study the detailed characteristics of several absorption bands of methane and molecules of ammonia and hydrogen, and to perform low resolution broadband measurements of the 619 nanometer and 725 nanometer bands of methane, which have been studied with prior NSF support. Study of planetary atmospheres relies heavily on spectroscopic measurements of molecular absorption lines such as those of methane, ammonia, and hydrogen. Among the necessary data are molecular line intensities and collisional broadening ceofficients, particularly at low temperatures. Over the past two years Dr. Atkinson and colleagues have developed and validated an intracavity laser spectroscopy (ILS) technique which was used to measure line intensities and pressure broadening coefficients of narrow lines in the 619 nanometer band of methane. They also developed a technique for using ILS to make broadband, low resolution, measurements necessary for interpreting filter photometry. With the current grant these scientists will expand these ILS measurements to other wavelength bands and molecular species of interest in planetary sciences.

Drs。亚利桑那大学的Atkinson、Hunten和Lunine将使用一种广泛适用的实验室光谱学技术来研究甲烷、氨和氢分子的几个吸收带的详细特征，并对甲烷的619纳米和725纳米波段进行低分辨率宽带测量。这些研究是在国家科学基金会的支持下进行的。行星大气的研究在很大程度上依赖于分子吸收谱线的光谱测量，如甲烷、氨和氢的吸收谱线。其中必要的数据是分子线强度和碰撞展宽系数，特别是在低温下。在过去的两年中，Atkinson博士和他的同事开发并验证了一种腔内激光光谱（ILS）技术，该技术用于测量甲烷619纳米波段的谱线强度和窄谱线的压力加宽系数。他们还开发了一种技术，利用ILS进行宽带、低分辨率的测量，这是解释滤光片光度测定所必需的。有了目前的拨款，这些科学家将把这些ILS测量扩展到其他波长波段和行星科学中感兴趣的分子物种。