Photoelectron imaging of resonance-enhanced multiphoton ionization and above-threshold ionization of ammonia molecules in a strong 800-nm laser pulse

Song Le-Le^{1, 2, 3}, Sun Ya-Nan^{1, 3}, Wang Yan-Hui⁴, Wang Xiao-Chun^{1, 3}, He Lan-Hai^{1, 3}, Luo Si-Zuo^{1, 3}, Hu Wen-Hui^{1, 3}, Tong Qiu-Nan^{1, 3}, Ding Da-Jun^{1, 3}, Liu Fu-Chun^{1, 3, †}

Angular distributions of same peak with different laser intensities. Panel (a) is from peak 1 and panel (b) is from peak 2. The r-coordinate refers to intensity / arb.unit.