High Harmonic Spectroscopy: Visualizing electronic excitation in NO2


Visualizing electronic excitation in NO2

When an NO2 molecule absorbs a photon, the energy is quickly dissipated through non-adiabatic processes.  Using transient-grating high harmonic spectroscopy, we are able to see how the populations on two electronic surfaces changes in the first 200 femtoseconds.

H. J. Wörner, J. B. Bertrand, B. Fabre, J. Higuet, H. Ruf, A. Dubrouil, S. Patchkovskii, M. Spanner, Y. Mairesse, V. Blanchet, E. Mével, E. Constant, P. B. Corkum, D. M. Villeneuve,
Conical Intersection Dynamics in NO2 Probed by Homodyne High-Harmonic Spectroscopy,
Science 334, 208 (2011)

Attosecond Science at uOttawa and NRC