Atoms radiative lifetimes, pulsed laser

Atomic Radiative Lifetimes Measured by Pulsed Laser Spectroscopy in the UV/VUV Spectral Region... 

U. Berzinsh, S. Svanberg Atomic radiative lifetimes measiired by pulsed laser spectroscop>y in the UV/VUV spectral region. Adv. Quantum Chem. 30, 283 (1998)... 

Unfortunately, the state selection attainable would be incomplete because typical laser pulse widths are usually shorter than atomic radiative lifetimes. 

In any low angular momentum state the radiative decay rate is usually dominated by the high frequency transitions to low lying states, and as a result it is impossible to control completely the decay rate using a millimeter wave cavity. In a circular i = m = n - 1 state the only decay is the far infrared transition to the n — 1 level, and Hulet et al. have observed the suppression of the decay of this level.26 They produced a beam of Cs atoms in the circular n = 22, = m = 21 state by pulsed laser excitation and an adiabatic rapid passage technique.27 The beam of circular state atoms then passed between a pair of plates 6.4 cm wide, 12.7 cm long, spaced by 230.1 jum, and held at 6 K. The 0 K radiative lifetime is 460ps, and... 

Because of the short radiative lifetimes of most electronically excited free atoms or molecules, the output power of many gas lasers does not show spikes, but follows quasistationarily the time dependence of the pump pulse. Since the relaxation rate of excited dye molecules is in the sub-nanosecond range, dye lasers also generally have no spiking behavior and Fig.11.1 applies to flashlamp-pumped arid laser-pumped dye lasers. 

Radiative lifetimes of atomic using pulsed dye and moleculav levels obtained laser excitation ... 

---