摘要:

The optical line shape of multiple qunatum well (MQW) structures has been analyzed based on the ordinary optical Bloch equation. This result shows that the dominating non‐Lorentzian peak is from light hole exciton and a weak dispersive‐like shape is due to the heavy hole exciton. The shapes given in the figures show an excellent agreement between the experimental observation and this theory.

ISSN:0094-243X    

DOI:10.1063/1.47474

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47475

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Within the ‘‘impact approximation,’’ calculation of line shapes requires accurate molecular scattering matrices which, in turn, requires solving for molecular collision dynamics on an accurate intermolecular potential energy surface. For some simple, but nontrival molecular systems the interaction potentials are now well determined fromab initioelectronic structure calculations and/or from analysis of spectra of the van der Waals complexes, and it is feasible to solve numerically the coupled channel scattering equations as well. In such cases predicted line widths and shifts are generally in satisfying accord with experiment. Recent results for line widths, line shifts, collisional transfer of intensity in overlapping lines, and Dicke narrowing are presented as examples of current capabilities.

ISSN:0094-243X    

DOI:10.1063/1.47476

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47525

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47478

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47479

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

We present high resolution (10−4cm−1) and high signal to noise ratio (2000) infrared lineshapes of CO perturbed by Xe, N2, and He in the intermediate regime from Doppler to collision broadening. It is found that the pressure broadened component of the lineshape cannot be fit by a Lorentzian lineshape. A speed dependent collisional width is required to fit the spectra, particularly when broadened by the larger Xe perturber. Based on the theory of Robertet al. [1992], a collision broadening lineshape model is derived, and we also include the effect of Dicke narrowing.

ISSN:0094-243X    

DOI:10.1063/1.47480

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

We report the broadening and shifting of the Raman Q branch lines in D2and D2‐ He mixtures, all at 305.2 K. From a linear fit of the widths and shifts as a function of density we have determined broadening and shifting coefficients with an uncertainty of ±0.5%. None of the existing semi‐classical or quantal coefficient agree with the measurements at this level of accuracy. As well we discuss nonlinear contributions to the widths and shifts. Measurements of the broadening of the depolarized part of the Q branch in D2are reported for the first time.

ISSN:0094-243X    

DOI:10.1063/1.47481

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47482

出版商:AIP    

年代:1995

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.47483

出版商:AIP    

年代:1995

数据来源: AIP