Green emission line

This phosphor has many emission lines in the blue, green, and red areas of the electromagnetic spectrum screens made from it have a whitish appearance... 

The experiments on the iodine separation were conducted as follows. A tubular vessel of pyrex glass, having at one end a plane window and at the other end a conical light-trap, was evacuated and then filled with iodine at about 0.17 mm. pressure, and then with hexene at about 6 mm. partial pressure. The tube was then subjected to the intense light from two Cooper-Hewitt glass mercury arcs, using a filter of 0.05 molal potassium dichromate 2 cm. in thickness to cut off all radiations on the violet side of the green mercury line. The lamps were rim at considerably below the rated capacity, and were cooled by a blast of air to keep the emission lines as narrow as possible. 

The wavelengths in bold type indicate the strong emission lines of a green star. 

Baddeleyite is characterized by bright green-blue luminescence (Fig. 4.41) with a decay time of 0.7-2.0 ps imder laser excitation (Gaft 1989). It was concluded that such an emission is connected with Ti impurity. Besides that, emission lines of trivalent Dy and Sm have been found in baddeleyite (Eremenko and Khrenov 1982). 

The main feature is the green emission corresponding to transitions from state S j2 to the ground state At the same time, an intense luminescence may be detected at 1.5 pm, which is caused by resonance transitions 13/215/2- The presence of green luminescence indicates that the de-activation of the high level accompanied by IR emission is not complete, but it results in a relatively short decay time of Er " green emission. Thus the luminescence of Er is easier to detect in time-resolved spectra with a narrow gate. In order for correct identification of Er " " lines in minerals several of them were synthesized and artificially activated by Er (Fig. 5.19). Besides that, comparison has been made with CL spectra of synthetic minerals artificially activated by Er (Blank et al. 2000). 

It was also revealed that Tm3+ ions doped in GaN QDs embedded in AIN layer are partially located in the GaN QDs and partially at the GaN/AIN interface by means of structural characterizations such as EXAFS and Rutherford backscattering spectroscopy (RBS) (Andreev et al., 2005a). Consistently, CL spectra (fig. 21) can be well interpreted by assuming that Tm3+ is located inside QDs but also in the surrounding AIN spacer. (1) Intense sharp emission lines from the 1le, JD2, and1G4 levels of Tm3+ in the blue-green region (450-550 nm), which were absent for the Tm-doped GaN thick layer, were observed in the PL spectrum (fig. 21b). This provides clear evidence for Tm3+ ions located in QDs. (2) Compared to the PL spectrum, the CL spectrum of the same GaN Tm QD sample (fig. 21c) shows additional sharp lines which coincide with those of the CL spectrum of AIN (fig. 2Id). Thus it confirms that Tm3+ ions are also present in the AIN barrier layer. 

Emission Spectrum. Several sources are suitable for exciting the emission spectrum of I2. In previous editions of this text, the use of a low-pressure mercury discharge lamp was described, in which the green Hg line at 546.074 nm causes a transition from... 

Very elegant experiments unequivocally proving the occurrence of electronic energy transfer were performed in 1922 and 1923 by Carlo and Franck [14], When a mixed vapor of mercury and thallium was irradiated with the mercury line at 253.67 nm, the emission lines of thallium could be observed in addition to the anticipated fluorescence spectrum of mercury. Since thallium cannot absorb 253.67-nm light, it must have been sensitized by the excited mercury atoms in order to produce the green fluorescence... 

Optical band edge excitation yields a strong blue emission. Near band edge excitation yields a green emission which has been ascribed to a WO3 group (Ref. 48, 50 compare Sect. 3.4.1). At low temperatures and under near band edge excitation two research groups 48,49) reported a zero-phonon line at about 370 nm (next to the... 

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