scholarly journals Accurate Wavenumber Measurement in High Resolution Stimulated Raman Spectroscopy (SRS) by Using an Infrared Standard. ν1 Fundamental of 12CH4

1992 ◽  
Vol 12 (1-2) ◽  
pp. 53-63 ◽  
Author(s):  
J. Santos ◽  
P. Cancio ◽  
J. L. Domenech ◽  
J. Rodriguez ◽  
D. Bermejo
Keyword(s):  
Laser Field ◽  
Stark Shift ◽  
Previous Measurement ◽  
Field Amplitude ◽  
Zero Field ◽  
Ir Absorption ◽  
Absolute Accuracy ◽  
Error Sources ◽  
Order Of Magnitude ◽  
Stimulated Raman

A new set of wavenumbers for the Stimulated Raman Spectrum (SRS) of the ν1 band of 12CH4 is presented using the Infrared (IR) absorption spectrum of the P10 component of ν3 of the same molecule as a wavenumbers standard. An estimation of the Stark shift due to the pump laser field is experimentally deduced what allows to extrapolate the measured wavenumbers to zero field amplitude. A careful discussion about the main possible error sources and how to cope with them is also included.The absolute accuracy of the wavenumbers set presented here is believed to be at least one order of magnitude better as compared with previous measurement.

scholarly journals Steps Towards Absolute Accuracy In Radial Velocities

1999 ◽  
Vol 170 ◽  
pp. 58-62
Author(s):  
Dag Gullberg
Keyword(s):  
Systematic Errors ◽  
Radial Velocities ◽  
Surface Gravity ◽  
Absolute Accuracy ◽  
Paper Briefly ◽  
Order Of Magnitude ◽  
The Absolute

AbstractWe are developing methods to reach high absolute accuracy in spectroscopic radial velocities for stars of different spectral types. The basic idea is to remove the effects from convection and surface gravity that cause large systematic errors, in order to improve the absolute accuracy of radial velocities by one order of magnitude. This paper briefly describes observations and methodology in computing the radial velocities.

Entropy squeezing, nonlocal correlation and purification properties of two-trap ion interaction with laser field in the presence of Stark shift effect

2019 ◽  
Vol 33 (12) ◽  
pp. 1950118
Author(s):  
Yas Al-Hadeethi ◽  
Bahaaudin M. Raffah ◽  
Nawal Almalky ◽  
E. M. Khalil
Keyword(s):  
Laser Field ◽  
Entanglement Entropy ◽  
Dynamical Behavior ◽  
Stark Shift ◽  
Entanglement Sudden Death ◽  
Entropy Squeezing ◽  
Trapped Ion ◽  
Nonlocal Correlation ◽  
Initial States ◽  
Shift Effect

In this paper, the interaction between two trap ions with laser beam and electromagnetic field containing the Stark shift terms has been investigated. The analytical solution for the differential equations which describes the system Hamiltonian is obtained. The dynamical behavior for the entanglement, entropy squeezing and purity of system are discussed. Some important physical characteristics such as revivals and collapses for the occupation of the trapped ion, entanglement sudden death (birth) and single trapped ion entropy squeezing are discussed. In addition, the influence of Lamb–Dicke parameter and the initial states on the evolution of the entanglement, linear entropy are studied. Finally, some remarks about the obtained results are given briefly.

Infrared Absorption from Low Carbon Concentration, Low Dose, Annealed CZ Silicon

2007 ◽  
Vol 131-133 ◽  
pp. 207-212 ◽  
Author(s):  
N. Inoue ◽  
Y. Goto ◽  
T. Sugiyama
Keyword(s):  
Infrared Absorption ◽  
Carbon Concentration ◽  
Low Dose ◽  
Absorption Lines ◽  
Ir Absorption ◽  
Absorption Analysis ◽  
Low Carbon ◽  
Dose Irradiation ◽  
Highly Sensitive ◽  
Order Of Magnitude

Complexes formed by low dose irradiation with electron (1015-16/cm2) and He (5x1012- 5x1013/cm2) in the relatively low carbon concentration (1016/cm3) MCZ silicon were investigated by highly sensitive and quantitative IR absorption analysis. CiOi and VO were the main complexes in all cases. The concentration of these complexes was about 1015/cm3, or 10% of included carbon in the highest case. Loss of almost equal amount of Cs was observed. The concentration of CiOiI was one order of magnitude lower. Upon annealing, these lines weakened and almost disappeared at 400 oC. There were some absorption lines introduced by the annealing. VO2 was strongest among them and CsOi related structure was also confirmed. There were absorption lines at 954.9 and 962.6 cm-1 appeared after annealing at 300 oC.

scholarly journals On the errors involved in ice-thickness estimates III: error in volume

2016 ◽  
Vol 62 (236) ◽  
pp. 1030-1036 ◽  
Author(s):  
A. MARTÍN-ESPAÑOL ◽  
J. J. LAPAZARAN ◽  
J. OTERO ◽  
F. J. NAVARRO
Keyword(s):  
Grid Point ◽  
Ice Thickness ◽  
Error Sources ◽  
Equivalent Number ◽  
Order Of Magnitude ◽  
Equivalent Area ◽  
Thickness Error ◽  
Grid Points ◽  
Area Of Influence

ABSTRACTThis paper is the third (Paper III) in a set of studies of the errors involved in the estimate of ice thickness and ice volume. Here we present a methodology to estimate the error in the calculation of the volume of an ice mass from an ice-thickness DEM. We consider the two main error sources: the ice-thickness error at each DEM grid point and the uncertainty in the boundary delineation. To accurately estimate the volume error due to the error in thickness of the DEM, it is crucial to determine the degree of correlation among the ice-thickness errors at the grid points. We find that the two-dimensional integral range, which represents the equivalent area of influence of each independent value, allows estimation of the equivalent number of independent values of error within the DEM. Hence, it provides an easy way to obtain the volume error resulting from the uncertainty in ice thickness of a DEM. We show that the volume error arising from the uncertainty in boundary delineation, often neglected in the literature, can be of the same order of magnitude as the volume error resulting from ice-thickness errors. We illustrate our methodology through the case study of Werenskioldbreen, Svalbard.

scholarly journals New precise measurements of muonium hyperfine structure at J-PARC MUSE

2019 ◽  
Vol 198 ◽  
pp. 00003 ◽  
Author(s):  
P. Strasser ◽  
M. Abe ◽  
M. Aoki ◽  
S. Choi ◽  
Y. Fukao ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Quantum Electrodynamics ◽  
Field Measurements ◽  
Bound State ◽  
New Physics ◽  
Muon Beam ◽  
Current Status ◽  
Zero Field ◽  
Order Of Magnitude ◽  
Muon Magnetic Moment

High precision measurements of the ground state hyperfine structure (HFS) of muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants of the muon magnetic moment and mass, and searches for new physics. Muonium is the most suitable system to test QED because both theoretical and experimental values can be precisely determined. Previous measurements were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is planning complementary measurements of muonium HFS both at zero and high magnetic field. The new high-intensity muon beam that will soon be available at H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation for high-field measurements, and the latest results at zero field are presented.

THEORETICAL STUDY OF ABOVE THRESHOLD DISSOCIATION OF HD+ IN FEMTOSECOND LASER FIELDS

2009 ◽  
Vol 08 (06) ◽  
pp. 1197-1215 ◽  
Author(s):  
KAI-JUN YUAN ◽  
ZHENG-TANG LIU ◽  
JIE YU ◽  
MAO-DU CHEN ◽  
SHU-LIN CONG
Keyword(s):  
Kinetic Energy ◽  
Femtosecond Laser ◽  
Laser Field ◽  
Three Dimensional ◽  
Stark Shift ◽  
Molecular Rotation ◽  
Photon Absorption ◽  
Intense Laser ◽  
Intense Laser Field ◽  
Linearly Polarized

The above threshold dissociation (ATD) of the HD+ molecular ion in a linearly polarized femtosecond laser field is theoretically studied using three-dimensional time-dependent quantum wave packet method. Based on the Born–Oppenheimer approximation (BOA), calculations are performed on two electronic states, the ground state 1sσ and the excited state 2pσ. The energy-dependent distributions of the dissociated fragments, resulting from the ATD, are calculated by using an asymptotic-flow expression in the momentum space. The numerical results demonstrate that, in the laser field of wavelength λ = 800 nm and full-width at half-maximum (FWHM) τ = 30 fs , only two-photon dissociation is observable at a weaker pulse peak intensity, 5.0 × 1012 W cm -2, while at an intense intensity, 1.5 × 1015 W cm -2, the dissociated fragments resulting from four-photon absorption dominates over the photodissociation process. These results are consistent with the experimental observation of Orr et al. [Orr PA et al., Phys Rev Lett98:163001, 2007]. The ac Stark-shift caused by intense laser field will change the kinetic energies of the fragments. The ATD phenomena are quantitatively interpreted in terms of the concept of light-induced potential. The molecular rotation and alignment have some effects on the kinetic energy spectrum of the dissociated fragments. The molecular rotation reduces the ac Stark-shift and broadens the peaks of kinetic energy spectra of the dissociated fragments. However, the intense laser field can effectively align the molecule and is helpful to increase the ATD probability. The ATD spectrum is related to the initial quantum numbers J0 and M0 of the molecule. The ATD spectrum of HD+ is calculated at a limited thermal temperature.

DONOR AND ACCEPTOR STATES IN GaAs-(Ga, Al)As QUANTUM DOTS: EFFECTS OF HYDROSTATIC PRESSURE AND AN INTENSE LASER

2010 ◽  
Vol 24 (29) ◽  
pp. 5761-5770 ◽  
Author(s):  
A. MIGUEZ ◽  
R. FRANCO ◽  
J. SILVA-VALENCIA
Keyword(s):  
Quantum Dots ◽  
Hydrostatic Pressure ◽  
Binding Energy ◽  
Laser Field ◽  
Binding Energies ◽  
Field Amplitude ◽  
Pressure Effects ◽  
Intense Laser ◽  
Mass Approximation ◽  
Donor And Acceptor

We calculated the binding energies of shallow donors and acceptors in a spherical GaAs - Ga 1-x Al x As quantum dot under the combined effect of isotropic hydrostatic pressure and an intense laser. We used a variational approach within the effective mass approximation. The binding energy was computed as a function of hydrostatic pressure, dot sizes and laser field amplitude. The results showed that the impurity binding energy increases with pressure and decreases with the laser field amplitude when other parameters are fixed. We also found that the pressure effects are more dramatic for donor than acceptor impurities, especially for quantum dots with small radii.

scholarly journals Magic Wavelengths for 1S–nS and 2S–nS Transitions in Hydrogenlike Systems

Atoms ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Chandra M. Adhikari ◽  
Jonathan C. Canales ◽  
Thusitha P. W. Arthanayaka ◽  
Ulrich D. Jentschura
Keyword(s):  
Excited State ◽  
Laser Field ◽  
Deuterium Atom ◽  
Laser Frequency ◽  
Stark Shift ◽  
Transition Frequency ◽  
Two Photon ◽  
The Stability

We study the magic wavelength for two-photon 1S–nS transitions in a hydrogen and deuterium atom, as well as 2S–nS transitions, where the lower level is the metastable 2S state. At the magic wavelength, the dynamic Stark shifts of the ground and the excited state of the transition coincide, so that the transition frequency is independent of the intensity of the trapping laser field. Experimentally feasible magic wavelengths of transitions with small slopes in the atomic polarizabilities are determined; these are the most stable magic wavelengths against variations of the laser frequency. We provide data for the magic wavelengths for the 1S–nS and 2S–nS transitions in hydrogen and deuterium, with n=2,⋯,8. We also analyze the stability of the elimination of the ac Stark shift at the magic wavelength against tiny variations of the trapping laser frequency from the magic value.

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