نتایج جستجو برای: emission spectra

تعداد نتایج: 275624  

Journal: :Journal of the Illuminating Engineering Institute of Japan 1990

2006
Thorsten Renk Jörg Ruppert

Previous dilepton measurements in heavy-ion collisions have mainly focused on invariant mass spectra to clarify in-medium changes of vector meson properties. However, a dimuon is characterized by two scales — invariant mass M and transverse momentum pT . Like transverse momentum spectra of hadrons, pT spectra of dileptons arise from an interplay between emission temperature and collective trans...

Journal: :Physical review letters 2013
Arthur Babuty Karl Joulain Pierre-Olivier Chapuis Jean-Jacques Greffet Yannick De Wilde

We report local spectra of the near-field thermal emission recorded by a Fourier transform infrared spectrometer, using a tungsten tip as a local scatterer coupling the near-field thermal emission to the far field. Spectra recorded on silicon carbide and silicon dioxide exhibit temporal coherence due to thermally excited surface waves. Finally, we evaluate the ability of this spectroscopy to pr...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2003
Shoji Kurata Masatoshi Nagai

The emission spectra of luminescent trivalent europium (Eu3+) and terbium (Tb3+) complexes were measured using a microscope laser Raman spectrometer with a doubled Nd:YAG laser (532 nm) and an Ar laser (488 nm). Excitation at 532 and 488 nm corresponded to wavelengths of the 7F1 --> 5D1 band of Eu3+ and the 7F6 --> 5D4 band of Tb3+, respectively. The Eu3+ and Tb3+ complexes were discriminated b...

1998
F. Nicastro F. Fiore G. Matt

We present photoionization models accounting for both photoelectric and resonant absorption. We demonstrate that resonance absorption lines are detectable even in moderate resolution X-ray spectra of type 1 AGN. The spectra transmitted by gas illuminated by the ionizing continua typical of flat X-ray spectrum, broad optical emission line type 1 AGN, and steep X-ray spectrum, narrow optical emis...

2003
S. J. Xu H. J. Wang S. H. Cheung Q. Li X. Q. Dai M. H. Xie S. Y. Tong

A number of wurtzite GaN epilayers directly grown on 4H-SiC ~0001! misoriented by 0, 3.5°, 5°, 8°, and 21° with plasma-assisted molecular-beam epitaxy were optically characterized with photoluminescence and excitation spectra. An intense shallow-defect emission peak locating at energy position ;70 meV lower than the near band edge emission peak at 3.47 eV is found in the emission spectra of the...

2010
Takao Itoh

Emission and excitation spectra of chromone and 6-fluorochromone have been measured in the vapor phase at different temperatures and pressures along with the absorption spectra. The emission is shown to consist of the (n, *) phosphorescence accompanied by weak S1(n, *) delayed fluorescence. It is inferred from the temperature dependence of the phosphorescence intensity that the (n, *) state ...

1999
T. Keating S. H. Park J. Minch X. Jin S. L. Chuang T. Tanbun-Ek

We present high accuracy measurements of gain, loss, and transparency energy in long-wavelength semiconductors based on a hybrid approach using the fundamental relationship between the gain and the spontaneous emission spectra. Independent measurements of optical gain, transparency energy, and loss show the accuracy and validity of this technique. These results are compared with those obtained ...

F. Yazdanparast M. Rabbani

Eosin is one of the original dyes of xanthenes derivatives. It is also one of the main derivatives of fluorescein and has brilliant fluorescence. Eosin disodium salt called "Eosin Y" is the most useful form of this compound. In common procedures, eosin is usually obtained by the action of bromine on fluorescein, which has not good yield and purity degree. In this research, it is prepared by the...

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