Linear- and circular-polarization photoionization angular distributions in H{sub 2} and H{sub 2}{sup +} by attosecond xuv laser pulses
- Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1 (Canada)
Numerical solutions of the time-dependent Schroedinger equation, using a new unitary numerical method, are used to obtain gauge-independent photoionization angular distributions for two-dimensional (planar) models of aligned H{sub 2} and H{sub 2}{sup +} molecules in different electronic states. Simulations are performed with few-cycle attosecond (as) extreme-ultraviolet (xuv) laser pulses at wavelengths {lambda}= 10 nm [{omega}= 4.56 a.u. (atomic units), {tau}=2{pi}/{omega}= 1.38 a.u. = 33.4 as], and {lambda}= 5 nm ({omega}= 9.11 a.u., {tau}= 16.7 as) for linear and circular polarization ionizations at R{sub e}=1.675 a.u., where molecular orbital configurations dominate for which the electron wavelengths {lambda}{sub e{>=}}R{sub e} and at large internuclear distance R=10 a.u. ({lambda}{sub e}<R) where Heitler-London atomic configurations including ionic states H{sup +}H{sup -} are more appropriate. The simulations allow one to investigate the effects of electron correlation and entanglement in H{sub 2} at different R due to electron spin exchange as compared to the delocalized one-electron H{sub 2}{sup +} system. An ultrashort (delta function) pulse model is used to interpret interferences in momentum distributions.
- OSTI ID:
- 21544660
- Journal Information:
- Physical Review. A, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevA.83.043418; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR DISTRIBUTION
DELTA FUNCTION
ELECTRON CORRELATION
EXTREME ULTRAVIOLET RADIATION
HYDROGEN IONS 1 MINUS
HYDROGEN IONS 1 PLUS
HYDROGEN IONS 2 PLUS
INTERATOMIC DISTANCES
LASER RADIATION
MOLECULAR ORBITAL METHOD
NUMERICAL SOLUTION
PHOTOIONIZATION
QUANTUM ENTANGLEMENT
SCHROEDINGER EQUATION
SIMULATION
SPIN EXCHANGE
TWO-DIMENSIONAL CALCULATIONS
WAVELENGTHS
ANIONS
CALCULATION METHODS
CATIONS
CHARGED PARTICLES
CORRELATIONS
DIFFERENTIAL EQUATIONS
DISTANCE
DISTRIBUTION
ELECTROMAGNETIC RADIATION
EQUATIONS
FUNCTIONS
HYDROGEN IONS
IONIZATION
IONS
MATHEMATICAL SOLUTIONS
MOLECULAR IONS
PARTIAL DIFFERENTIAL EQUATIONS
RADIATIONS
ULTRAVIOLET RADIATION
WAVE EQUATIONS