Non-adiabatic photodissociation dynamics of BrCl

1994 ◽  
Vol 72 (3) ◽  
pp. 758-761 ◽  
Author(s):  
Jianying Cao ◽  
Hans-Peter Loock ◽  
Charles X.W. Qian
Keyword(s):  
Laser Radiation ◽  
Potential Energy ◽  
Multiphoton Ionization ◽  
Branching Ratio ◽  
Tunable Laser ◽  
Branching Ratios ◽  
Excitation Wavelength ◽  
Dissociation Dynamics ◽  
Adiabatic Transitions ◽  
Insight Into

Nozzle-cooled BrCl was excited with tunable laser radiation at selected wavelengths between 389 and 500 nm. The chlorine atomic fragments in their Cl*(2P1/2) and Cl(2P3/2) state were stated-selectively probed by resonance-enhanced multiphoton ionization. The branching ratio (Cl*/(Cl + Cl*)) was measured as a function of the excitation wavelength. The relative Cl* yield reaches a maximum at around λphot = 460 nm. Decomposition of these branching ratios into Cl and Cl* photofragment yield spectra provides insight into the BrCl B-state 3П(0+) non-adiabatic dissociation dynamics. Our results suggest that the dissociation mechanism involves non-adiabatic transitions among 0+ potential energy curves.

scholarly journals Disentangling QCD and new physics in D → πℓ+ℓ−

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Aoife Bharucha ◽  
Diogo Boito ◽  
Cédric Méaux
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
Branching Ratios ◽  
New Physics ◽  
Operator Product ◽  
Beyond The Standard Model ◽  
Spectral Functions ◽  
The Standard Model ◽  
Model Independent ◽  
Weak Annihilation

Abstract In this paper we consider the decay D+ → π+ℓ+ℓ−, addressing in particular the resonance contributions as well as the relatively large contributions from the weak annihilation diagrams. For the weak annihilation diagrams we include known results from QCD factorisation at low q2 and at high q2, adapting the existing calculation for B decays in the Operator Product Expansion. The hadronic resonance contributions are obtained through a dispersion relation, modelling the spectral functions as towers of Regge-like resonances in each channel, as suggested by Shifman, imposing the partonic behaviour in the deep Euclidean. The parameters of the model are extracted using e+e− → (hadrons) and τ → (hadrons) + ντ data as well as the branching ratios for the resonant decays D+ → π+R(R → ℓ+ℓ−), with R = ρ, ω, and ϕ. We perform a thorough error analysis, and present our results for the Standard Model differential branching ratio as a function of q2. Focusing then on the observables FH and AFB, we consider the sensitivity of this channel to effects of physics beyond the Standard Model, both in a model independent way and for the case of leptoquarks.

Multiphoton Ionization of Ammonia Clusters with a Tunable Laser

1984 ◽  
Vol 88 (3) ◽  
pp. 217-219 ◽  
Author(s):  
O. Echt ◽  
S. Morgan ◽  
P. D. Dao ◽  
R. J. Stanley ◽  
A. W. Castleman
Keyword(s):  
Multiphoton Ionization ◽  
Tunable Laser ◽  
Ammonia Clusters

CONTROLLING ABOVE-THRESHOLD DISSOCIATION BRANCHING RATIOS OF HD+ WITH FEMTOSECOND LASER PULSE TRAIN

2012 ◽  
Vol 11 (04) ◽  
pp. 709-721 ◽  
Author(s):  
QIAN-ZHEN SU ◽  
JIE YU ◽  
KAI-JUN YUAN ◽  
SHU-LIN CONG
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Train ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Pulse Number ◽  
Molecular Ions ◽  
Quantum Wave ◽  
Energy Dependent

Above-threshold dissociation (ATD) process of the molecular ions HD+ steered by a femtosecond laser pulse train (LPT) is investigated theoretically using the time-dependent quantum wave packet method. Energy-dependent distributions of ATD fragments are analyzed by using an asymptotic-flow expression in the momentum space. It is found that fragment kinetic energy spectra shift to low energy region with increasing pulse number of LPT. The photofragment branching ratio between the 1sσg and 2pσu dissociation channels is sensitive to the pulse number of LPT. The momentum distribution of the ATD fragments is discussed in detail.

Resonant Multiphoton Ionization of Krypton by Intense uv Laser Radiation

1987 ◽  
Vol 59 (22) ◽  
pp. 2558-2561 ◽  
Author(s):  
O. L. Landen ◽  
M. D. Perry ◽  
E. M. Campbell
Keyword(s):  
Laser Radiation ◽  
Multiphoton Ionization ◽  
Uv Laser

scholarly journals Energy, orbital and structural stacking landscape of a purine homodimer system

2020 ◽  
Vol 139 (10) ◽  
Author(s):  
Tomasz Sierański
Keyword(s):  
Potential Energy ◽  
Intermolecular Interactions ◽  
Potential Energy Surfaces ◽  
Natural Bond Orbital ◽  
Natural Bond Orbital Analysis ◽  
Energy Sources ◽  
Energy Decomposition ◽  
Energy Surfaces ◽  
Orbital Analysis ◽  
Insight Into

Abstract The multidimensional study, combining the extensive calculations of potential energy surfaces for the parallel-displaced configurations and methods such as energy decomposition and natural bond orbital analysis, has been carried out. The resulted data give an energy, orbital and structural landscapes of this biologically essential system. The balance of the two energy sources, electrostatic and dispersion, is clearly visible. The obtained results, taken as a whole, provide an insight into the hierarchy of intermolecular interactions in the purine system, together with their sources.

scholarly journals THE B→Xsl+l- AND B→Xsγ DECAYS WITH THE FOURTH GENERATION

1999 ◽  
Vol 14 (35) ◽  
pp. 2453-2462 ◽  
Author(s):  
CHAO-SHANG HUANG ◽  
WU-JUN HUO ◽  
YUE-LIANG WU
Keyword(s):  
B Meson ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Fourth Generation ◽  
B Meson Decays ◽  
Meson Decays

If the fourth generation fermions exist, the new quarks could influence the branching ratios of the decays of B→Xsγ and B→Xsl+l-. We obtain two solutions of the fourth generation CKM factor [Formula: see text] from the decay of B→ Xsγ. We use these two solutions to calculate the new contributions of the fourth generation quark to Wilson coefficients of the decay of B→ Xsl+l-. The branching ratio and the forward–backward asymmetry of the decay of B→ Xsl+l- in the two cases are calculated. Our results are quite different from that of SM in one case, almost the same in another case. If Nature chooses the former, the B meson decays could provide a possible test of the fourth generation existence.

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