Fig. 4
Measured and calculated frequency shifts and nuclear motions of H2 and D2. a Measured and calculated red shift Δω in MHOHG with respect to harmonics of Ar as a function of the harmonic order. b The HHG asymmetry coefficients η calculated for H2 and D2. η(ω) > 0(<0) means the harmonic emission is more pronounced at the trailing (leading) edge of the laser pulse. Squares and circles are for H2 and D2, respectively. c Calculated (solid line) and experimentally retrieved (dash-dotted line) nuclear vibration of H2. d Same as c, but for D2. Shaded areas in a represent the standard deviation of nine independent measurements
