The excitation spectrum
of nucleons can especially help us to understand the strong interaction in the nonperturbative regime.
Caption: Figure 7: EDX spectrum (a) and PL excitation spectrum
(b) of the precursor after thermal annealing at 600[degrees]C for 2h.
It was studied in earlier step that the two peaks which were observed in the excitation spectrum
of reference compound 4 i.e.
To understand the cause of a given emission, we collected an excitation spectrum
across all excitation wavelengths, measuring the intensity of the green fluorescence excited or induced by each one.
"With this technique, we can engineer an excitation spectrum
of the atoms," says physicist Li-Chung Ha, lead author of the paper.
Compared with excitation spectrum
of [ohm] = 2125 rad/s, the amplitude of the double frequency component relatively increases when the whirl frequency ([ohm]) is 4250 rad/s (as shown in Figure 16(b)).
Depending on the recorded emission wavelength, we measured the excitation spectrum
of each group, then determined the fluorescence peak position from the excitation spectrum
and recorded the corresponding excitation wavelength.
Here, denominator [D.sub.m] is the function whose zeros (the poles of [G.sub.m]) define the excitation spectrum
, corresponding to the dispersion equation [D.sub.m] = 0 specified above.
The reader will recall from the June Primer that fluorescence is the property whereby a dye molecule can absorb a photon of a defined wavelength range (its excitation spectrum
) and rapidly re-emit this photon at a lower energy (and thus a shifted wavelength or color, in the dye's emission spectrum).
Though the description of the methods for designing of binary multifrequency waveforms is out of the scope of this paper, however, it must be noted that such type of excitation signals allow versatile adapting the shape of the excitation spectrum
to the spectrum of the object to be measured.
The [Ca.sub.3][V.sub.2][O.sub.8] has its main excitation spectrum
in the UV region (below 330 nm), but Sr and Mg components showed red shift and extended up to 370, while Zn component extends further to 400 nm.
Among the topics are the accuracy of quantum Monte Carlo methods for point defects in solids, accurate gap levels and their role in the reliability of other calculated defect properties, predicting polaronic defect states by means of generalized Koopmans density functional calculations, a time-dependent density functional study on the excitation spectrum
of point defects in semiconductors, and criteria for selecting which electronic structure method to use.