Stark effect on the lowest excited state of the 2,4,5‐trimethylbenzyl radical in a durene host crystal

1976 ◽  
Vol 64 (9) ◽  
pp. 3753-3756 ◽  
Author(s):  
Y. Udagawa ◽  
D. M. Hanson
Keyword(s):  
Excited State ◽  
Stark Effect ◽  
Host Crystal

Experimental evidence for Stark effect on FA(II) centers in KCl:Li relaxed excited state

1990 ◽  
Vol 75 (5-6) ◽  
pp. 401-405 ◽  
Author(s):  
P. Minguzzi ◽  
F. Pozzi ◽  
M. Tonelli ◽  
G. Baldacchini ◽  
U.M. Grassano
Keyword(s):  
Excited State ◽  
Experimental Evidence ◽  
Stark Effect

The Micro wave Spectrum of Bromoacetylene ; rs-Structure , Dipole Moment, Quadrupole Coupling Constants and Excited Vibration States

1977 ◽  
Vol 32 (8) ◽  
pp. 866-875 ◽  
Author(s):  
H. Jones ◽  
J. Sheridan ◽  
O. L. Stiefvater
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Stark Effect ◽  
Wave Spectrum ◽  
Normal Modes ◽  
Coupling Constants ◽  
Fermi Resonance ◽  
Bending Vibrations ◽  
Excited Vibration ◽  
Quadrupole Coupling

Abstract The microwave spectrum of bromoacetylene has been investigated in the frequency range from 7 GHz to 35 GHz. From Stark effect measurements the dipole moment has been determined as μ = 0.23 + 0.01 D, and the restructure has been derived in four independent ways from twelve isotopic species: C - H = 1.0553 Å, C ≡ C = 1.2038 Å, C - Br = 1.7913 Å (internal consistency better than ± 0.0003 Å). Quadrupole coupling constants have been determined for eleven isotopic forms and are e q Q = 541.47 MHz and 648.00 MHz for HCCBr81 and HCCBr79, respectively. Rotation spectra have also been observed for excited states of the three lowest normal modes and for several isotopic forms. For the Br81 (Br79) species the rotation-vibration coefficients are α5 = -10.98 (-11.02) MHz, α4 = -1.57 (- 1.61) MHz and α3 = + 12.88 (+ 13.40) MHz. For the bending vibrations, ν5 and ν4 , l-type doubling constants are obtained as ql5 = 4.14 (4.17) MHz and ql4 = 2.6 MHz. Analysis of the Fermi resonance between the first excited state of ν3 and the l = 0 component of the second excited state of ν5 gives the mixing ratio of these two states as a/b = 1.45 (1.51) and the interaction energy as W3,5 = 1.313 (1.181) δ3,5 for the Br81 (Br79) species. With an approximate value of δ3,5 ≌ 25 cm-1, the cubic force constant is obtained as κ3,55 ≌ 44 cm-1.The results are discussed in relation to the molecular properties of other halogen acetylenes and halogen cyanides.

Interference spectra in a two-level atom

1990 ◽  
Vol 68 (12) ◽  
pp. 1389-1395 ◽  
Author(s):  
Constantine Mavroyannis
Keyword(s):  
Excited State ◽  
High Intensity ◽  
Laser Field ◽  
Stark Effect ◽  
Ground States ◽  
Spectral Functions ◽  
Laser Photon ◽  
Level Atom ◽  
Dynamic Stark Effect ◽  
Two Peaks

We have considered the interference spectra arising from the competition between a spontaneous process and one induced by a laser field in a two-level atom. Expressions for the spectral functions have been derived describing the spectra of the excited and ground states of the atom in the low- and high-intensity limit of the laser field. For the excited-state spectra in the low-intensity limit, the frequency profiles of the two peaks, which arise from the spontaneous and the induced processes, cancel each other out completely near the center of the line, while for the ground state the induced process dominates. For finite values of the detuning, the spectra of the excited state consist of two peaks, which have positive and negative frequency profiles, respectively. The computed spectra have been graphically presented and discussed. In the high-intensity limit, the dynamic Stark effect dominates the spectra of the excited and ground states of the atom. Expressions for the correlation functions have been derived that describe the emission or the absorption of a laser photon at two different times. The derived expressions for the corresponding delay functions in the low- and high-intensity limits have been found to be identical to those recently proposed in the literature. The laser field has been treated as a classical as well as a quantized entity.

Cavity quantum physics

Quantum 20/20 ◽  
2019 ◽  
pp. 201-224
Author(s):  
Ian R. Kenyon
Keyword(s):  
Excited State ◽  
Quantum Physics ◽  
Stark Effect ◽  
Cavity Mode ◽  
Rydberg Atoms ◽  
Penning Trap ◽  
Atomic State ◽  
Optical Clock ◽  
The Difference ◽  
Ac Stark Effect

The model of a cavity-enclosed 2-state atom with transition frequency near resonant with a cavity mode is introduced. For conditions where their coupling dominates the Jaynes–Cummings model is described. Rabi flopping of energy between atom’s excited state and the cavity mode is recounted. Hybrid states and the AC Stark effect are discussed. Experiments with Rydberg atoms revealing the quantum nature of the cavity-atom state are discussed. Then mechanisms for trapping ions are outlined and the use of a single mercury ion as the pendulum of an optical clock is described. This relies on shelving to make non-demolition measurements on the ion. Then the measurement of (g-2) for the electron using an electron in a Penning trap is related. The quantity of interest, is the difference between the cyclotron and spin precession frequencies: its measurement by a different non-demolition technique is detailed. Finally the Purcell effect is presented, by which the lifetime of an atomic state in a cavity can be shortened or lengthened.

Two-dimensional quantum-confined Stark effect in V-groove quantum wires: Excited state spectroscopy and theory

1999 ◽  
Vol 74 (16) ◽  
pp. 2334-2336 ◽  
Author(s):  
H. Weman ◽  
E. Martinet ◽  
M.-A. Dupertuis ◽  
A. Rudra ◽  
K. Leifer ◽  
...  
Keyword(s):  
Excited State ◽  
Stark Effect ◽  
Quantum Wires ◽  
Two Dimensional ◽  
Quantum Confined Stark Effect ◽  
Quantum Confined
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