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and P
states of alkali-metal atomsItakura, Ryuji
no journal, ,
In this study, we propose a method for characterizing attosecond pulses by means of angle-resolved photoelectron spectroscopy of alkali-metal atoms in the 2P state. Photoelectron spectroscopy of a coherent superposition of the spin-orbit split P and P states allows us to observe the spectral shearing interference through the measurement of the quantum beat between 
P and P. The spectral shearing interference is useful for determination of the spectral phase of attosecond pulses.
Yokoyama, Keiichi; Sugita, Akihiro; Teranishi, Yoshiaki*; Itakura, Ryuji; Matsuoka, Leo; Yokoyama, Atsushi
no journal, ,
State-selective excitation of atomic cesium and potassium to their spin-orbit states, Cs(7D-6S) and K(4P-4S), are carried out by a coherent quantum control technique. In the weak field regime, ultrafast and highly selective excitation of cesium atoms has been successfully demonstrated with a pair of identical transform-limited pulses in which the control parameter is the phase difference between the two pulses alone. However, the excitation probability is very small (0.001) due to the weak laser field. To perform the selective excitation with large excitation probability (1), one-photon process of the K(4P-4S) transition is examined. The excitation probability is expected to become large while the selectivity degrades if the control parameter is the phase difference alone. The obtained laser intensity dependence agrees well with the theoretical prediction, indicating the excitation indeed in the non-perturbative regime.