title: Coherence decay measurement of v = 2 vibrons in solid parahydrogen.
abstract: The coherence decay of the v = 2 vibrational state (vibrons) of solid parahydrogen was measured via time-resolved coherent anti-Stokes Raman spectroscopy. We found that the decay curve has a non-exponential time profile in the time scale of 200 ns at a low temperature below 5 K and a low orthohydrogen impurity concentration (~0.01%). This behavior, as also observed in the case of the v = 1 vibrons, represents a signature of band structure of the v = 2 state in the solid phase. The maximum coherence decay time of 50 ns in an exponential part was achieved, which shows excellence of the v = 2 state for coherent processes. We also found that finite temperatures, orthohydrogen impurities, and other structural inhomogeneity accelerate the decay, hiding the non-exponential feature of the vibron band.
authors: Research Core for Extreme Quantum World, Okayama University, Okayama 700-8530, Japan. susumukuma@fphy.hep.okayama-u.ac.jp
authors: Susumu
authors: S
authors: Kuma
authors: Yuki
authors: Y
authors: Miyamoto
authors: Kyo
authors: K
authors: Nakajima
authors: Atsushi
authors: A
authors: Fukumi
authors: Kentarou
authors: K
authors: Kawaguchi
authors: Itsuo
authors: I
authors: Nakano
authors: Noboru
authors: N
authors: Sasao
authors: Minoru
authors: M
authors: Tanaka
authors: Jian
authors: J
authors: Tang
authors: Takashi
authors: T
authors: Taniguchi
authors: Satoshi
authors: S
authors: Uetake
authors: Tomonari
authors: T
authors: Wakabayashi
authors: Akihiro
authors: A
authors: Yoshimi
authors: Motohiko
authors: M
authors: Yoshimura
mesh_terms: D006859:Hydrogen / Q000737:chemistry*; D060739:Phonons; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013696:Temperature
chemical_list: D006859:Hydrogen