Attosecond transient absorption spectroscopy of molecular nitrogen: Vibrational coherences in the b%26apos; (1)Sigma(+)(u) state

作者：Warrick Erika R; Baekhoj Jens E; Cao Wei; Fidler Ashley P; Jensen Frank; Madsen Lars Bojer; Leone Stephen R; Neumark Daniel M

来源：Chemical Physics Letters, 2017, 683: 408-415.

DOI：10.1016/j.cplett.2017.02.013

Nuclear and electronic dynamics in a wavepacket comprising bound Rydberg and valence electronic states of nitrogen from 12 to 15 eV are investigated using attosecond transient absorption. Vibrational quantum beats with a fundamental period of 50 femtoseconds persist for a picosecond in the b' (1)Sigma(+)(u) valence state. Multi- state calculations show that these coherences result primarily from near infraredinduced coupling between the inner and outer regions of the b' (1)Sigma(+)(u) state potential and the dark a'' (1)Sigma(+)(u) state. The excellent spectral and temporal resolution of this technique allows measurement of the anharmonicity of the b' (1)Sigma(+)(u) potential directly from the observed quantum beats.

• 出版日期2017-9-1