Photoionization cross sections of rovibrationallevels of the B 1 ~ : state of H 2
نویسندگان
چکیده
We report theoretical cross sections for direct photoionization of specific rovibrationallevels of the B 1 ~u+ electronic state of H 2• The calculated cross sections differ considerably from values recently determined by resonant enhanced multiphoton ionization (REMPI) studies. In an attempt to understand the disagreement, we analyze in detail the REMPI dynamics and find that the multi photon ionization probability is extremely sensitive to the spatial and temporal profiles of the laser pulses. Accurate characterization oflaser profiles and their jitter is therefore necessary for a comparison between theory and experiment.
منابع مشابه
Determining the partial photoionization cross-sections of ethyl radicals.
Using a crossed laser-molecular beam scattering apparatus, these experiments photodissociate ethyl chloride at 193 nm and detect the Cl and ethyl products, resolved by their center-of-mass recoil velocities, with vacuum ultraviolet photoionization. The data determine the relative partial cross-sections for the photoionization of ethyl radicals to form C2H5+, C2H4+, and C2H3+ at 12.1 and 13.8 eV...
متن کاملSelf-consistent ab initio calculations for photoionization and electron-ion recombination using the R-matrix method
Most astrophysical plasmas entail a balance between ionization and recombination. We present new results from the powerful R-matrix method which yields in an ab initio manner: (I) self-consistent photoionization and recombination cross sections using identical wavefunction expansions, (II) unified e-ion recombination rates at all temperatures of interest, incorporating non-resonant and resonant...
متن کاملELECTRON-ION RECOMBINATION RATE COEFFICIENTS AND PHOTOIONIZATION CROSS SECTIONS FOR ASTROPHYSICALLY ABUNDANT ELEMENTS. X. Ne viii AND Ne ix FOR ULTRAVIOLET AND X-RAY MODELING
Results are presented for the inverse processes of photoionization and electron-ion recombination of (h þ Ne viii$ Ne ixþ e) and (h þ Ne ix$ Ne xþ e) using the self-consistent unified method. The method employs an identical wave function expansion for both photoionization and recombination, and it includes both radiative and dielectronic recombination. Total, as well as level-specific, photoion...
متن کاملTotal photoionization cross-sections of excited electronic states by the algebraic diagrammatic construction-Stieltjes-Lanczos method.
Here, we extend the L2 ab initio method for molecular photoionization cross-sections introduced in Gokhberg et al. [J. Chem. Phys. 130, 064104 (2009)] and benchmarked in Ruberti et al. [J. Chem. Phys. 139, 144107 (2013)] to the calculation of total photoionization cross-sections of molecules in electronically excited states. The method is based on the ab initio description of molecular electron...
متن کاملPhotoionization of Ar XVI and Ar XVII
Photoionization of Li-like argon, ðhnþAr XVI-Ar XVIIþeÞ, and He-like argon, ðhnþ Ar XVII-Ar XVIIIþeÞ, are studied using the relativistic Breit–Pauli R-matrix (BPRM) method. Results include both the partial and total photoionization cross-sections of fine structure levels with 1=2r Jr17=2, nr10 and 0r lr9 of Ar XVI and with 0r Jr10, nr10 and 0r lr9 of Ar XVII. They correspond to 98 bound levels ...
متن کامل