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利用CARS技术研究激发态Rb_2和H_2的碰撞转移
  • ISSN号:1000-0593
  • 期刊名称:光谱学与光谱分析
  • 时间:0
  • 页码:604-607
  • 分类:O561.5[理学—原子与分子物理;理学—物理]
  • 作者机构:[1]西安交通大学理学院,陕西西安710049, [2]新疆大学物理科学与技术学院,新疆乌鲁木齐830046
  • 相关基金:国家自然科学基金项目(10964011)和新疆维吾尔自治区高校科研计划项目(XJEDU2011S01)资助
  • 相关项目:碱分子激发态与氢分子间的电子-振转能量转移
中文摘要:

光学一光学双共振激发NaK至61∑+高位电子态,研究了NaK(61∑+)与H2的电子一振转能量转移。利用相干反斯托克斯拉曼散射(CARS)光谱技术检测H2的振转态分布。扫描CARS谱表明H2在(1,1),(2,1),(2,2),(2,3),(3,1),(3,2),(3,3)和(3,5)振转能级上有布居。对于(3,1),(3,2),(3,3)和(3,5)能级,扫描CARS谱峰值直接给出布居数之比。对于(1,1),(2,1),(2,2)和(2,3)能级,扫描CARS谱峰值给出二个可能的布居数之比,利用一个速率方程组,由时间分辨CARS轮廓可以得到真实的比值。用n1-~ns分别表示Hz的(3,1),(2,1),(1,1),(3,3),(2,3),(2,2),(3,2)和(3,5)能级上布居密度,得到m/n1~n8/n1分别为0.51,0.97,0.45,0.18,0.10,0.26和0.31。利用Stem-Volmer公式,得到6’乏’态的总退布速率系数为(2.1±0.4)×10^-10cm^3s^-1,由H2各振转能级布居数之比,得到61∑+-(1,1),(2,1),(2,2),(2,3),(3,1),(3,2),(3,3)和(3,5)转移速率系数(10^-11cm^3·s^-1单位)分别为5.4±1.6,2.8±0.8,0.6±0.2,1.0±0.3,5.6±1.7,1.4±0.4,2.5±0.8和1.7±0.5。

英文摘要:

The electronic to rovibrational energy transfer between the high-lying 61∑+ state of NaK and H2 was investigated. The 61∑+ state was excited using the optical-optical double resonance technique. Radiative processes were monitored by fluores- cence from the61∑+ state to the ground 11∑+ state. The CARS (coherent anti-Stokes Raman scattering) spectral technique was used to probe the internal state distribution of collisionally-populated H2 molecules. The scanned CARS spectra reveal that dur- ing E-V, R energy transfer processes H2 molecules are produced at v=1, 2 and 3 levels. The semilog plot of the time-resolved H2 (3, 1) CARS intensity was obtained at a pressure of 4X 104 Pa of Hz. The slop yields an effective quenching rate of 8. 09× 10^5 s^-1. Analogically, for (3, 2), (3, 3) and (3, 5) levels, the quenching rates are 6. 11×10^5 , 4. 32×105 and 2. 45×10s s-1 , respectively. For (3, 1), (3, 2), (3, 3) and (3, 5) levels, the population ratios were obtained from scanned CARS spectral peaks. For (1, 1), (2, 1), (2, 2) and (2,3) levels, from scanned CARS spectral peaks two possible population ratios were yielded. Through shape simulations of time resolved CARS profiles under a kinetic model the actual population ratios were deter- mined. The n2/n1, n3/n1, n4/n1, n5/n1, n6/n1, n1/n1 and ns/n1 are 0.51, 0. 97, 0. 45, 0.18, 0. 10, 0. 26 and 0. 31, where nx, n2, n3, n4, n5, n6, n7 andn8 represent the number densities of H2 at (3, 1), (2, 1), (1, 1), (3, 3), (2, 3), (2, 2), (3, 2) and (3,5) levels, respectively. The H2 molecules produced by energy transfer process were populated by 26 % at the v= 1 level, 21% at v=2 and 53% at v=3. The major vibrational energy [-(9.0±2.7)× 103 cm-1] release and the minor rotational energy [(3. 9±1.1)× 102 em 1] release are showrL Based on the Stern-Volmer equation, the radiative lifetime is (5.0±1. 3) ns for the 61∑+ state, the total rate coefficient for deactivati

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期刊信息
  • 《光谱学与光谱分析》
  • 中国科技核心期刊
  • 主管单位:中国科学技术协会
  • 主办单位:中国光学学会
  • 主编:高松
  • 地址:北京海淀区魏公村学院南路76号
  • 邮编:100081
  • 邮箱:chngpxygpfx@vip.sina.com
  • 电话:010-62181070
  • 国际标准刊号:ISSN:1000-0593
  • 国内统一刊号:ISSN:11-2200/O4
  • 邮发代号:82-68
  • 获奖情况:
  • 1992年北京出版局编辑质量奖,1996年中国科协优秀科技期刊奖,1997-2000获中国科协择优支持基础性高科技学术期刊奖
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),荷兰文摘与引文数据库,美国工程索引,美国生物医学检索系统,美国科学引文索引(扩展库),英国科学文摘数据库,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),英国英国皇家化学学会文摘,中国北大核心期刊(2000版)
  • 被引量:40642