title: The Jahn-Teller effect in the electron momentum spectroscopy of ammonia.
abstract: The 1e and 3a(1) bands of the ammonia molecule have been studied using the high-resolution electron momentum spectroscopy at impact energies of 1200 and 600 eV. Several slices of 1e and 3a(1) bands in the different binding energy ranges were selected, and their electron-momentum distributions were carefully compared. The discernable difference among the distributions of the selected slices of the 1e band shows that the Jahn-Teller effect indeed influences the electron momentum distribution of the 1e orbital of ammonia.
authors.affiliation: State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: J S
authors.initials: JS
authors.lastname: Zhu
authors.forename: Y R
authors.initials: YR
authors.lastname: Miao
authors.forename: J K
authors.initials: JK
authors.lastname: Deng
authors.forename: C G
authors.initials: CG
authors.lastname: Ning