Mechanisms of Nonuniform Line Broadening

Photoabsorption spectra of Na(+)(n) clusters: thermal line-broadening mechanisms.

Photoabsorption cross sections of small sodium cluster cations ( Na(+)(n), n = 3, 5, 7, and 9) were calculated at various temperatures with the time-dependent local-density approximation in conjunction with ab initio molecular dynamics simulations, yielding spectra that agree with measured ones without ad hoc line broadening or renormalization. Three thermal line-broadening mechanisms are revea...

Exchange broadening of EPR line in ZnO:Co

We study the X -band EPR spectra of Co in single crystalline Zn1 xCoxO (x = 0.001–0.075) thin films grown by plasma-assisted molecular beam epitaxy. By analyzing the EPR linewidth behavior we argue that the exchange-narrowing model, usually applied to Mn-based II-VI DMS, fails here and that a combined effect of exchange and dipolar broadening can explain the linewidth variation with Co content ...

Mecanismos de alargamento de linhas espectrais atômicas Line broadening mechanisms of atomic spectral lines

Os espectros de energia de átomos idealizados (isolados, parados e em temperatura 0K) são constitúıdos por um conjunto de linhas muito estreitas. Contudo, no mundo real, verifica-se que cada uma destas linhas são alargadas pela ação de vários tipos de influências externas. Uma discussão simplificada é apresentada sobre seus mecanismos e como cada um deles atua isoladamente sobre as linhas espec...

Optical Line Width Broadening Mechanisms at the 10 kHz Level in Eu:Y2O3 Nanoparticles - Supporting information

Micromaser line broadening without photon exchange

We perform a calculation of the linewidth of a micromaser, using the master equation and the quantum regression approach. A ‘dephasing’ contribution is identified from pumping processes that conserve the photon number and do not appear in the photon statistics. We work out examples for a single-atom maser with a precisely controlled coupling and for a laser where the interaction time is broadly...