Raman Chirped Adiabatic Passage: a New Method for Selective Excitation of High Vibrational States
✍ Scribed by S. Chelkowski; A. D. Bandrauk
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 417 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
It is demonstrated that efficient and high vibrational excitation can be achieved using non-resonant stimulated Raman transitions for subsequent step by step climbing of vibrational levels. The pump laser (or both the pump and Stokes laser) frequency are to be swept in such a way that the frequency di †erence sweeping allows molecular anharmonicities of the Ðnal states to be matched. It is shown that amplitudes of successive Raman transitions can be quantitatively described with the help of the e †ective Raman two-level systems. This selective scheme of vibrational excitation, called Raman chirped adiabatic passage (RCAP), should be useful in controlling excited-state populations and chemical reactions. The limitations of another well known adiabatic scheme of population transfer, stimulated Raman adiabatic passage (STIRAP), are outlined and it is shown that RCAP is a complementary method to STIRAP. RCAP should be useful for selective excitation of highly polarizable symmetric bonds such as metal-metal bonds.