Above-threshold ionization of hydrogen atom in chirped laser fields<xref rid="cpb_27_7_073203fn1" ref-type="fn">*</xref> <fn id="cpb_27_7_073203fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11664035, 11465016, 11764038, 11364038, and 11564033).</p> </fn>

Above-threshold ionization of hydrogen atom in chirped laser fields* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 11664035, 11465016, 11764038, 11364038, and 11564033).

Ni Yuan-Yuan¹, Zhao Song-Feng^{1, †}, Li Xiao-Yong², Wang Guo-Li¹, Zhou Xiao-Xin¹

(color online) Photoelectron angular distributions of H at different photoelectron energies by the chirped pulses with three chirp rates: ξ = −1.73 (solid), ξ = 0 (dashed), and ξ = 1.73 (dot-dashed). The orders of the ATI peaks are (a) S = 1, (b) S = 2, (c) S = 3, and (d) S = 4, as labeled in Fig. 2(b). The laser parameters are the same as those in Fig. 2.