Quantum state specific reactant preparation in a molecular beam by rapid adiabatic passage

被引:30
作者
Chadwick, Helen [1 ]
Hundt, P. Morten [1 ]
van Reijzen, Maarten E. [1 ]
Yoder, Bruce L. [1 ]
Beck, Rainer D. [1 ]
机构
[1] Ecole Polytech Fed Lausanne, Lab Chim Phys Mol, Lausanne, Switzerland
基金
瑞士国家科学基金会;
关键词
INDUCED POPULATION TRANSFER; RABI OSCILLATIONS; LASER; METHANE; CHEMISORPTION; BAND; SPECTROSCOPY; TRANSITIONS; ABSORPTION;
D O I
10.1063/1.4861054
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Highly efficient preparation of molecules in a specific rovibrationally excited state for gas/surface reactivity measurements is achieved in a molecular beam using tunable infrared (IR) radiation from a single mode continuous wave optical parametric oscillator (cw-OPO). We demonstrate that with appropriate focusing of the IR radiation, molecules in the molecular beam crossing the fixed frequency IR field experience a Doppler tuning that can be adjusted to achieve complete population inversion of a two-level system by rapid adiabatic passage (RAP). A room temperature pyroelectric detector is used to monitor the excited fraction in the molecular beam and the population inversion is detected and quantified using IR bleaching by a second IR-OPO. The second OPO is also used for complete population transfer to an overtone or combination vibration via double resonance excitation using two spatially separated RAP processes. (C) 2014 AIP Publishing LLC.
引用
收藏
页数:9
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