包含振动激发态的准直O_2分子的隧穿电离研究

Research of Tunneling Ionization for Alignment O_2 Molecules Involving Vibrational Excited States

通过MO-ADK理论,计算了强激光场中准直O2分子不同振动激发态(改变分子间距离)下的隧穿电离率.结果表明,当取向角约为35°时,各个态的电离率和相应最高占据分子轨道(HOMO)的电子密度最大,且分子间距离越大,电离率和相应HOMO的电子密度越大,即最高占据分子轨道的电子密度分布决定了隧穿电离率的角分布.此结论与实验符合得较好.为进一步深入研究和探索振动对分子隧穿电离的影响提供了新的思路.

The tunneling ionization rates of different vibrational excited 02 molecules at the ground electronic state are calculated by using molecular orbital Ammosov-Delone-Krainov （MO- ADK） theory with a consideration of averaging R-dependence of ionization. The results show that the ionization ratesand the electron density distribution of highest occupied molecular orbital （HOMO） are maximum as the orientation angle is about 35 degree, and the ionization ratesand the electron density distribution of HOMO increase with increasing the internuclear distance R, the ionization rate is mainly determined by the electron density distribution of HOMO. Our conclusion is consistent with the experiment. Our research provides a new method for further !n-depth study and exploration in vibrational impact on molecular tunneling ionization.