RUI: Low Temperature Energy Transfer Studies of Interstellar Species

RUI：星际物种的低温能量转移研究

• 批准号: 0653175
• 负责人: Daniel Willey
• 金额: --
• 依托单位: Allegheny College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-01 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0653175&HistoricalAwards=false
• 关键词: RUI; Low; Temperature; Energy; Transfer

This RUI research project focuses on the investigation of low temperature collisions and energy transfer of three molecules of astrophysical interest: ammonia (NH3), carbonyl sulfide (OCS), and methanol (CH3OH). Energy-transferring collisional processes are to be measured by microwave-microwave double resonance spectroscopic techniques and pressure broadening measurements in low-temperature (10 to 40 K) samples in a cell. The studies will investigate energy transfer among low-lying rotational levels induced by collisions with helium and molecular hydrogen. The results of these studies will be used to test and refine recently calculated BH3-He/H2 and OCS-He/H2 potential energy surfaces. The broader impact of the research will involve the training of undergraduate students who will participate through summer research experiences and senior research projects. Results of the measurements will also be important to the understanding of the dynamics of ammonia, carbonyl sulfide and methanol collisions in cold interstellar molecular clouds and to an analysis of recent observations of ammonia and carbonyl sulfide trapped in liquid helium droplets. The methanol studies may shed light on the mechanism for pumping certain types of interstellar methanol masers.

该研究项目的重点是研究三种具有天体物理学意义的分子的低温碰撞和能量转移：氨（NH3），羰基硫（OCS）和甲醇（CH 3OH）。 能量转移碰撞过程是测量微波-微波双共振光谱技术和压力展宽测量在低温（10至40 K）样品中的细胞。 这些研究将调查与氦和氢分子碰撞引起的低转动能级之间的能量转移。这些研究的结果将用于测试和完善最近计算的BH 3-He/H2和OCS-He/H2势能面。研究的更广泛的影响将涉及本科生的培训，他们将通过夏季研究经验和高级研究项目参与。 测量的结果也将是重要的氨，硫化羰和甲醇碰撞在冷星际分子云的动力学的理解和分析最近的观测氨和硫化羰被困在液氦液滴。 甲醇的研究可能有助于阐明某些类型的星际甲醇脉泽的抽运机制。