title: Optical conversion of conical intersection to avoided crossing.
abstract: We study a mechanism by which a symmetry-allowed conical intersection is converted to an avoided crossing by external breaking of symmetry. With full quantum dynamics on coupled ab initio potential energy surfaces for an NO(2) molecule under a phase controlled far-infrared femtosecond pulse field, we demonstrate that symmetry breaking thus-introduced can indeed convert the conical intersection to an avoided crossing, thereby drastically influencing population transfer through it.
authors.affiliation: Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, 153-8902, Tokyo, Japan.
authors.forename: Yasuki
authors.initials: Y
authors.lastname: Arasaki
authors.forename: Kazuo
authors.initials: K
authors.lastname: Takatsuka