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Attosecond transient absorption spectroscopy of molecular nitrogen: Vibrational coherences in the b′1Σ+ustate

  • Author(s): Warrick, ER
  • Bækhøj, JE
  • Cao, W
  • Fidler, AP
  • Jensen, F
  • Madsen, LB
  • Leone, SR
  • Neumark, DM
  • et al.
Abstract

© 2017 Elsevier B.V. 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′1Σ+uvalence state. Multi-state calculations show that these coherences result primarily from near infrared-induced coupling between the inner and outer regions of the b′1Σ+ustate potential and the dark a″1Σ+gstate. The excellent spectral and temporal resolution of this technique allows measurement of the anharmonicity of the b′1Σ+upotential directly from the observed quantum beats.

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