Fig. 4: Isotope effect in attosecond photoemission time delays.
From: Attosecond delays between dissociative and non-dissociative ionization of polyatomic molecules

Measured and calculated relative photoionization delays between the non-dissociative (a) and dissociative (b) channels. The one-photon Wigner time delay τwig is also shown. The error bars show the standard deviation.