Excitation energy dependence in the electronic dephasing time of the NO dimer

The wavelength dependence of the electronic dephasing time in the optically excited state of the NO dimer has been measured by femtosecond pump–probe photoelectron imaging for the range of 200–235 nm. The observed dephasing time increased from 0.2 to 1 ps towards longer photoexcitation wavelengths. The 3s Rydberg state was formed with similar time constants for excitation wavelengths of λ<220 nm.