上海科技大学知识管理系统

The recent measurement of the generalized oscillator strengths (GOSs) for (A) over tilde B-1(1) and (B) over tilde (1)A(1) of H2O exhibits the apparent deviations from the first Born approximation calculations in the large squared momentum transfer region [W. Q. Xu et al., Phys. Rev. A 103, 032808 (2021)]. Here a simplified theoretical model was proposed to calculate the GOSs of the two excitations at large momentum transfer within the second Born approximation. The accord of the experimental GOSs and the theoretical ones is improved, but the differences still exist. In addition, the GOSs and the integral cross sections for the higher excitations of H2O in 9.85-12.15 eV are presented, which could be used to complete the database of electron-impact excitation cross sections of H2O and be beneficial for modeling interaction processes between electrons and H2O in the earth's atmosphere, plasmas, radiation physics, biology, etc.