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Cavity-enhanced velocity modulation spectroscopy

机译：腔增强速度调制光谱

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摘要

The spectroscopic study of molecular ions is of great importance to a variety of fields, but is challenging as ions are typically produced in plasmas containing many orders of magnitude more neutral molecules than ions. The successful technique of velocity modulation permits discrimination between ion and neutral absorption signals and has allowed the study of scores of molecular ions in the past quarter century. However, this technique has long been considered to be inappropriate for use with cavity-enhanced techniques, owing to the directional nature of the velocity modulation. Here we report what we believe to be the first demonstration of cavity-enhanced velocity modulation spectroscopy, utilizing a 2fphase-sensitive demodulation scheme. This approach offers the promise of combining very high-sensitivity spectroscopic techniques with ion-neutral discrimination, which could extend the applicability of velocity modulation to intrinsically weak transitions and to ions that cannot be produced in high abundance. The use of a cavity also permits Lamb dip spectroscopy, which offers higher resolution and precision in frequency measurements and may be useful in measuring collisional rate coefficients.
机译：分子离子的光谱研究在各个领域都非常重要，但具有挑战性，因为离子通常在含有比离子多许多数量级的等离子体中产生。成功的速度调制技术可以区分离子和中性吸收信号，并且可以在过去的25世纪研究分子离子的分数。然而，由于速度调制的方向性，长期以来一直认为该技术不适用于腔增强技术。在这里，我们报告我们相信是利用2f相位敏感的解调方案进行腔增强速度调制光谱的首次演示。这种方法提供了将非常高灵敏度的光谱技术与离子中性鉴别相结合的希望，这可以将速度调制的适用性扩展到本质上较弱的跃迁和无法高丰度产生的离子。腔体的使用还允许进行Lamb浸没光谱，从而可以在频率测量中提供更高的分辨率和精度，并且在测量碰撞率系数时可能会有用。

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  • 来源
    《Optics Letters》 |2010年第8期|p.1266-1268|共3页
  • 作者

    Brian M. Siller1 Andrew A. Mills1 and Benjamin J. McCall12*;

  • 作者单位

    1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, USA 2Departments of Astronomy and Physics, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, Illinois 61801, USA;

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