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排序方式: 共有149条查询结果,搜索用时 31 毫秒
21.
We have studied the physics of atoms with permanent electric dipole moment and nonvanishing magnetic moment interacting with an electric field and inhomogeneous magnetic field. This system can be demonstrated as the atomic analogue of Landau quantization of charged particles in a uniform magnetic field. This Landau-like atomic problem is also studied with space-space noncommutative coordinates. 相似文献
22.
A. Banerjee M.K. Harbola 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,5(2):201-206
Employing a near exact Hylleraas wavefunction we calculate various third-order nonlinear optical properties for the helium
atom within the time-dependent Kohn-Sham theory. In our calculations we employ the adiabatic local-density approximation (ALDA)
for the exchange and correlation kernels fxc and gxc, and compare the numbers obtained by us with the available accurate theoretical as well as experimental results. Our results
demonstrate the accuracy of ALDA for the calculation of nonlinear optical properties of many electron systems.
Received: 22 June 1998 / Accepted: 15 October 1998 相似文献
23.
Z. X. Qiao Y. C. Liu L. M. Yu Z. M. Gao 《Applied Physics A: Materials Science & Processing》2009,95(3):917-922
The variation of microstructural formation and the hardness of the 30CrNi3Mo steel were systematically explored as a function
of applied cooling rates in the range of 1–500°C/min. According to the measured Rockwell hardness results, four characteristic
stages could be separated as different ranges of cooling rates, which corresponds well with the microstructural evolution
observed. With the applied cooling rate increasing, the transformed structure evolves from granular bainite, lower bainite,
self-tempered martensite, to finally martensite without self-tempering. Among them, the self-tempered martensite, obtained
in the transformed specimens cooled with rates of 25–80°C/min, exhibits the highest hardness values due to the precipitation
of fine carbides within it. 相似文献
24.
Super-High Resolution Time Interval Measurement Method Based on Time-Space Relationships 总被引:1,自引:0,他引:1
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Based on the principle of quantized delay-time, a super-high resolution time interval measurement method is proposed based on time-space relationships. Using the delay-time stability that time and frequency signal travel in a specific medium, the measured time interval can be quantized. Combined with the phase coincidence detection technique, the measurement of time can be changed into the measurement of space length. The resolution and the stability of the measurement system are easily improved. Experimental results show that the measurement resolution of the measured time interval depends on the length difference of the double delay-time unit. When the length difference is set up on millimeter level or sub-millimeter level, super-high measurement resolution from hundreds of picosecond to tens of picosecond can be obtained. 相似文献
25.
We show that defect-free splay-bend textures are less energetic compared to uniform states in liquid-crystalline phases that
possess both quadrupolar (nematic) and octupolar (tetrahedratic) order. This is because, in such systems, there is a symmetry-allowed
linear gradient term in the energy. Another unusual feature of these splay-bend textures is the fact that they have a non-homogeneous,
space-dependent free-energy density. These results may help clarify some mysterious features noted for the B7 liquid-crystal
phase formed by achiral banana-shaped molecules. 相似文献
26.
Sabyasachi Kar Yu-Shu Wang Zishi Jiang Yang Wang Yew Kam Ho 《Chinese Journal of Physics (Taipei)》2018,56(6):3085-3098
In this article, we review or report recent works on atomic wavelengths in screening environments. We mainly review recent works on the transition, tune-out and magic wavelengths with Coulomb and screened Coulomb potentials. We also present our investigation on tune-out and magic wavelengths for two-electron Yukawa atoms. The various transition wavelengths for two-electron systems with and without screening environments are also presented. 相似文献
27.
J. Walls J. Clarke S. Cauchi G. Karkas H. Chen W.A. van Wijngaarden 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,14(1):9-13
Polarizabilities of several rubidium states were determined by measuring stark shifts of transitions using an electro-optically
modulated laser beam to excite an atomic beam. The voltage required for atoms excited by the laser beam in an electric field
to be simultaneously in resonance as atoms excited by a frequency sideband of the laser in a field free region was measured.
The scalar α
and tensor α
2
polarizabilities were found to be: α
(9
S
1/2
) = 103.77±0.09, α
(10
S
1/2
) = 272.54±0.16, α
(8
D
3/2
) = 230.68±0.25 and α
2
(8
D
3/2
) = 26.55±0.10, α
(8
D
5/2
) = 222.68±0.14 and α
2
(8
D
5/2
) = 51.91±0.10 MHz/(kV/cm)2. The results are 100 times more accurate than previous measurements and are within 1% of those found theoretically using
a Coulomb approximation calculation.
Received 7 September 2000 and Received in final form 6 December 2000 相似文献
28.
2 lasers based on either a quartz or an alumina waveguide were studied on the 00°2 - [10°1,02°1]I,II sequence bands. A compact multisegment RF excitation with capacitive coupling was used for pumping the gain section of the
laser waveguide. The use of a separate intracavity hot CO2 waveguide suppresses the regular-band transitions. The quartz waveguide laser has a total of 62 lines lasing on both the
9.4 and 10.4 μm sequence bands. The alumina waveguide laser has 40 lines lasing on the 10.4 μm sequence band. These lasers
can be either pulsed or continuous-wave (CW) operated on the selected line without a line jumping problem.
Received: 29 September 1997/Revised version: 2 December 1997 相似文献
29.
T. Suzuki Y. Tanaka A. Onae M. Tachikawa T. Shimizu 《Applied physics. B, Lasers and optics》1988,45(2):87-91
A small-signal gain in CO2 waveguide laser medium has been measured on rotational-vibrational transitions in the P-branch of the (0, 0, 1)-(0, 20, 0) band. It has been found that the rotational temperature is well defined in the waveguide laser system where high excitation power is injected and a large amount of energy is flowing through vibrational, rotational, and translational degrees of freedom. The rotational temperature is slightly higher than the translational temperature. 相似文献
30.