title: Large pressure effect on the angular distribution of two Lyman-alpha photons emitted by an entangled pair of H(2p) atoms in the photodissociation of H2.
abstract: The angular distribution of two Lyman-alpha photons, i.e., the probability density that two Lyman-alpha photons are emitted in given directions, in the photodissociation of a hydrogen molecule have been measured at the hydrogen gas pressures of 0.40 and 0.13 Pa. We have found that the experimental angular distributions seem to approach the theoretical one by our group [J. Phys. B 40, 617 (2007)] with decreasing pressure, which indicates the generation of the entangled pair of H(2p) atoms shown in the theory and the role of the reaction of the entangled pair of H(2p) atoms with an H2 molecule that efficiently changes the entanglement.
authors.affiliation: Department of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors.forename: Takehiko
authors.initials: T
authors.lastname: Tanabe
authors.forename: Takeshi
authors.initials: T
authors.lastname: Odagiri
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Nakano
authors.forename: Isao H
authors.initials: IH
authors.lastname: Suzuki
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Kouchi