Cross sections and angular distributions for individual fragment fine structure levels produced in one‐ and two‐photon photodissociation of NaH

1984 ◽  
Vol 81 (7) ◽  
pp. 3091-3101 ◽  
Author(s):  
Sherwin J. Singer ◽  
Karl F. Freed ◽  
Yehuda B. Band
Keyword(s):  
Fine Structure ◽  
Cross Sections ◽  
Angular Distributions ◽  
Two Photon ◽  
Individual Fragment

scholarly journals Photoelectron Angular Distributions of Nonresonant Two-Photon Atomic Ionization Near Nonlinear Cooper Minima

Atoms ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 54
Author(s):  
Jiri Hofbrucker ◽  
Latifeh Eiri ◽  
Andrey V. Volotka ◽  
Stephan Fritzsche
Keyword(s):  
Cross Sections ◽  
Incident Light ◽  
Angular Distributions ◽  
Two Photon ◽  
Atomic Ionization ◽  
Independent Particle ◽  
Photon Ionization ◽  
Ionization Cross Sections ◽  
Photoelectron Angular Distributions ◽  
Asymmetry Parameters

Photoelectron angular distributions of the two-photon ionization of neutral atoms are theoretically investigated. Numerical calculations of two-photon ionization cross sections and asymmetry parameters are carried out within the independent-particle approximation and relativistic second-order perturbation theory. The dependence of the asymmetry parameters on the polarization and energy of the incident light as well as on the angular momentum properties of the ionized electron are investigated. While dynamic variations of the angular distributions at photon energies near intermediate level resonances are expected, we demonstrate that equally strong variations occur near the nonlinear Cooper minimum. The described phenomena is demonstrated on the example of two-photon ionization of magnesium atom.

82D3/2 ↔ 82D5/2 excitation transfer in rubidium induced in collisions with ground-state Rb atoms

1981 ◽  
Vol 59 (4) ◽  
pp. 548-554 ◽  
Author(s):  
M. Głódz ◽  
J. B. Atkinson ◽  
L. Krause
Keyword(s):  
Fine Structure ◽  
Cross Sections ◽  
Ground State ◽  
Photon Counting ◽  
Excitation Transfer ◽  
Atomic Fluorescence ◽  
Rubidium Vapor ◽  
Two Photon ◽  
Photon Excitation ◽  
Structure State

Cross sections for inelastic transfer between the 82D3/2 and 82D5/2 fine-structure states in rubidium, induced in resonant collisions with ground-state Rb atoms, have been determined using an experimental method involving two-photon excitation of atomic fluorescence. Rubidium vapor in a fluorescence cell was irradiated with pulses of 641 nm radiation from a N2 laser-pumped dye-laser tuned to excite one of the 82D states. The resulting fluorescence included the direct component originating from the optically excited state and a sensitized component arising from the other fine-structure state populated by collisions. Relative intensities of the fluorescent components, determined by photon-counting techniques, yielded the cross sections for excitation transfer: Q(2D3/2 → 2D5/2) = 8.1 × 10−13 cm2; Q(2D3/2 ← 2D5/2) = 5.5 × 1013 cm2; as well as [Formula: see text], the effective quenching cross section. The excitation transfer cross sections which are considered accurate to within ±20% are in the ratio predicted by the principle of detailed balancing.

Doppler-free two-photon spectroscopy of neon. III. Isotopic shift and fine structure for the 2p5 4d and 2p5 5s configurations

1979 ◽  
Vol 40 (12) ◽  
pp. 1139-1144 ◽  
Author(s):  
E. Giacobino ◽  
F. Biraben ◽  
E. de Clercq ◽  
K. Wohrer-Beroff ◽  
G. Grynberg
Keyword(s):  
Fine Structure ◽  
Isotopic Shift ◽  
Two Photon

Theoretical studies on the one- and two-photon absorption of tetrabenzoporphyrins and phthalocyanines

2004 ◽  
Vol 82 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xin Zhou ◽  
Ai-Min Ren ◽  
Ji-Kang Feng ◽  
Xiao-Juan Liu
Keyword(s):  
Dipole Moment ◽  
Cross Sections ◽  
Density Functional ◽  
Transition Dipole Moment ◽  
Photon Absorption ◽  
Transition Dipole ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
The One

The one-photon absorption (OPA) properties of tetrabenzoporphyrins (TBPs) and phthalocyanines (Pcs) were studied using the semiempirical ZINDO method and time-dependent density functional theory (TDDFT), respectively. The compared results confirmed that the semiempirical ZINDO method was reasonably reliable when calculating the OPA of tetrabenzoporphyrins and phthalocyanines. On the basis of the OPA properties obtained from the ZINDO method, two-photon absorption (TPA) properties of two series of molecules were investigated, using ZINDO and sum-over-states (SOS) methods. The results showed that the TPA cross-sections of all molecules were in the range of 220.6 × 10–50 – 345.9 × 10–50 cm4·s·photon–1, which were in the same order of magnitude as the values reported in the literature. The relatively larger δ(ω) value for Pcs with respect to that for corresponding TBPs originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment between S0 and S1 and the transition dipole moment between S1 and S5.Key words: two-photon absorption, ZINDO, sum-over-states, tetrabenzoporphyrin, phthalocyanines.

Fine Structure Transition Cross Sections of Ar+and Ne+in Collisions with Rare Gases

1990 ◽  
Vol 59 (3) ◽  
pp. 898-901 ◽  
Author(s):  
Atsushi Fukuroda ◽  
Nobuo Kobayashi ◽  
Yozaburo Kaneko
Keyword(s):  
Fine Structure ◽  
Cross Sections ◽  
Rare Gases ◽  
Structure Transition

Total Cross Sections and Angular Distributions forπ−pCharge Exchange in the Second and Third Resonance Regions

1964 ◽  
Vol 13 (18) ◽  
pp. 558-562 ◽  
Author(s):  
F. Bulos ◽  
R. E. Lanou ◽  
A. E. Pifer ◽  
A. M. Shapiro ◽  
M. Widgoff ◽  
...  
Keyword(s):  
Cross Sections ◽  
Angular Distributions ◽  
Total Cross Sections
Sign in / Sign up

Export Citation Format

Share Document