Two-Photon Spectroscopy of Acetylene - Photodissociation Processes at 9-10 eV Energy Levels

1990 ◽  
Vol 37 (2) ◽  
pp. 197-202 ◽  
Author(s):  
Ing-Fang Lee ◽  
Yuan-Hsiang Lee ◽  
Yen-Chu Hsu
Keyword(s):  
Energy Levels ◽  
Two Photon

Absolute hyperfine energy levels and isotope shift of Rb 5S–6S two-photon transition

2021 ◽  
Vol 54 (17) ◽  
pp. 175001
Author(s):  
S T Orson ◽  
C D McLaughlin ◽  
M D Lindsay ◽  
R J Knize
Keyword(s):  
Isotope Shift ◽  
Energy Levels ◽  
Two Photon ◽  
Photon Transition

scholarly journals Non-linear Simultaneous Two-Photon Excitation Energy Transfer in the Wrong Direction

1997 ◽  
Vol 17 (3) ◽  
pp. 161-174 ◽  
Author(s):  
M. Nickoleit ◽  
A. Uhl ◽  
J. Bendig
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Single Photon ◽  
Energy Levels ◽  
Excitation Energy Transfer ◽  
Laser Exposure ◽  
Two Photon ◽  
Photon Excitation ◽  
Covalently Linked ◽  
Two Photon Excitation

The simultaneous two-photon excitation energy transfer (SEET) was demonstrated for the first time using trichromophoric model compounds. Two identical donors (A–antenna) were covalently linked to an energy acceptor unit (T–target) with different energy levels preventing energy transfer of a single photon. At high intensity illumination (laser exposure) of a trichromophoric system A∼T∼A (A–fluorescein, erythrosin; T-Estilbene), sufficient to excite both of the appended donor subunits, population of the target excited state may occur via simultaneous energy transfer of two photons, one from each donor. In order to restrict reverse energy transfer from the higher energy target to the lower energy donor(s) it is necessary that the excited target unit undergoes an efficient photoreaction. In the investigated case this was achieved by photoisomerization of the stilbene unit used for monitoring of the SEET.

Theory of the energy levels and precise two-photon spectroscopy of atomic hydrogen and deuterium

1996 ◽  
Vol 29 (8) ◽  
pp. 1573-1573 ◽  
Author(s):  
K Pachucki ◽  
D Leibfried ◽  
M Weitz ◽  
A Huber ◽  
W König ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Energy Levels ◽  
Two Photon

High-accuracy calculations in the H+2 molecular ion: towards a measurement of mp/me

2007 ◽  
Vol 85 (5) ◽  
pp. 497-507 ◽  
Author(s):  
J Ph. Karr ◽  
F Bielsa ◽  
T Valenzuela ◽  
A Douillet ◽  
L Hilico ◽  
...  
Keyword(s):  
Vibrational Spectroscopy ◽  
Quantum Cascade Laser ◽  
Energy Levels ◽  
High Accuracy ◽  
Electron Mass ◽  
Mass Ratio ◽  
Molecular Ion ◽  
Quantum Cascade ◽  
Two Photon

We report on our recent advances in the calculation of the energy levels of the H+2 molecular ion, including relativistic and radiative corrections. These theoretical efforts are linked to the prospect of obtaining a new determination of the proton to electron mass ratio mp/me through precise vibrational spectroscopy of H+2. We describe the setup of our experiment, aiming at a measurement of the L = 2, υ = 0 → L = 2, υ = 1 two-photon transition at 9.166 μm using a phase-locked quantum cascade laser as excitation source.PACS Nos.: 31.15.Pf, 31.30.Jv, 32.10.Hq

scholarly journals Study of two-photon absorption and optical limiting

BIBECHANA ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 26-31
Author(s):  
Bal Ram Ghimire
Keyword(s):  
Ground State ◽  
Dynamic Range ◽  
Energy Levels ◽  
Fused Silica ◽  
Photon Absorption ◽  
Irreversible Damage ◽  
Transmitted Beam ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Limiters

Simultaneous absorption of two photons of identical or different frequencies to excite a system that is atom or molecule from the ground state to excited state has great importance. It has an important role as a spectroscopic tool for determining the positions of energy levels that are not connected to the atomic ground state by the one-photon transition. In this work, experimental study of two-photon absorption of fused silica, quartz crystal, and metal halides and optical limiters based on the semiconductors are studied. It was investigated that two photons absorption depletes the transmitted beam but carrier defocusing spreads the beam in space and hence density is reduced. It was realized that limiters with thin samples have low dynamic range and fluency is high on the damage-prone surface and irreversible damage occurs. Some Semiconductors with high nonlinearity are found to be useful materials for optical limiters to protect devices like sensors. BIBECHANA 18 (2) (2021) 26-31

scholarly journals Revealing the Target Electronic Structure with Under-Threshold RABBIITT

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 66
Author(s):  
Anatoli Kheifets
Keyword(s):  
Electronic Structure ◽  
Bound States ◽  
Energy Levels ◽  
Laser Frequency ◽  
Target Atom ◽  
Oscillator Strengths ◽  
Ionization Threshold ◽  
Discrete Energy ◽  
Two Photon

The process of reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) reveals the target atom electronic structure when one of the transitions proceeds from below the ionization threshold. Such an under-threshold RABBITT resonates with the target bound states and thus maps faithfully the discrete energy levels and the corresponding oscillator strengths. We demonstrate this sensitivity by considering the Ne atom driven by the combination of the XUV and IR pulses at the fundmanetal laser frequency in the 800 and 1000 nm ranges.

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