Multi-resonance effects within a single chirp in broadband rotational spectroscopy: The rapid adiabatic passage regime for benzonitrile
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- 作者：David Schmitz ; V. Alvin Shubert ; Thomas Betz ; Melanie Schnell
- 关键词：Broadband rotational spectroscopy ; Double resonance ; Chirped pulse ; Rapid-adiabatic passage
- 刊名：Journal of Molecular Spectroscopy
- 出版年：2012
- 出版时间：October, 2012
- 年：2012
- 卷：280
- 期：Complete
- 页码：77-84
- 全文大小：1759 K
文摘
We report here pronounced, stepwise multi-resonance excitations in benzonitrile arising from a single 1 ¦Ìs broadband 2-8.3 GHz microwave chirp, observed with our new chirped-pulse broadband rotational spectrometer, COMPACT. Such multi-resonance excitations significantly alter the relative intensity patterns and are a strong indication that, for the given experimental conditions and using benzonitrile as a polar test molecule (¦ÌA = 4.5152 D), the rapid adiabatic passage (RAP) regime for strong coupling must be applied. This finding is contrary to previous discussions of chirped-pulse rotational spectroscopy, where the linear fast passage regime of weak coupling has been assumed.