High-resolution time resolved spectroscopy of collisionless molecular beams: optical T1 and T2

✍ Scribed by A.H. Zewail; T.E. Orlowski; R.R. Shah; K.E. Jones

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 696 KB
• Volume: 49
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)87029-2

✦ Synopsis

1% report on the observation of the coherent and incoherent transients of collisionless molecular beams using single-modelaser spectroscopy. The technique offers a resolution of one part in lo*, and resolves the spectra on the time scale of nanosec-onds_ The method is demonstrated on-an effusive beam of iodine. Since the beam is collisionless the optical dephasing of the selectively excited (lo4 cm-') molecular packet can be directly related to the zero-pressure optical Tt obtained from the Stern-Volmer relationship of iodine gas in a bulb. Finally, the cross section for the radiationless and radiative deactivation are reported and related to the free-induction decay (FID) of the coherently excited molecular beam. 1 _ Introduction Molecules that are driven by an intense laser field undergo the well-known Rabi oscillations.

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