Emission mechanism

Table 11. Emission Mechanisms of Indoor Air Pollutants Arising from Activities and Consumer Products ...

In this paper, we report the structural and optical properties of InxGai-xN/GaN triangular shaped MQWs obtained under various conditions of growth variables. In addition, the emission mechanism of the InGaN QWs is intensively discussed. 

Abstract Sonoluminescence from alkali-metal salt solutions reveals excited state alkali - metal atom emission which exhibits asymmetrically-broadened lines. The location of the emission site is of interest as well as how nonvolatile ions are reduced and electronically excited. This chapter reviews sonoluminescence studies on alkali-metal atom emission in various environments. We focus on the emission mechanism does the emission occur in the gas phase within bubbles or in heated fluid at the bubble/liquid interface Many studies support the gas phase origin. The transfer of nonvolatile ions into bubbles is suggested to occur by means of liquid droplets, which are injected into bubbles during nonspherical bubble oscillation, bubble coalescence and/or bubble fragmentation. The line width of the alkali-metal atom emission may provide the relative density of gas at bubble collapse under the assumption of the gas phase origin. 

I. Tanaka, Y. Tabata, and S. Tokito, Energy-transfer and light-emission mechanism of blue phosphorescent molecules in guest-host systems, Chem. Phys. Lett., 400 86-89 (2004). 

These results are consistent with the occurrence of charge separation. Clearly, a number of questions concerning emission mechanisms remain open. 

Fig. 2 (a) Linear absorption spectrum obtained on a 540 /rg/ml of GFPuv solution in a 1 mm thick cuvette (solid line) compared to that of GFPwt (dotted line) (data of ref [3]). (b) Multi-level schematic representation of the GFP emission mechanism [3]. 

This chapter will not delve into emission mechanisms. However, building product emissions should be considered in relation to building occupancy/life cycle factors by ... 

A hypothetical aerosol size/composition distribution is shown in Figure 12.1, indicating that crustal materials (e.g., COf, Si, Al, Fe, Ca, and Mn), sea spray (e.g., Mg, Na, and Cl), and biogenic organic particles (e.g., pollen, spores, and plant fragments) are usually found in the coarse aerosol fraction (2.5 < r/ae < 10pm) (Meszaros et al., 1997 Krivacsy and Molnar, 1998 Matsumoto et al., 1998 Seinfeld and Pandis, 1998 Maenhaut et al., 2002 Smolik et al., 2003). Wind erosion, primary emissions, mechanical disruption, sea spray, and volcanic eruptions all contribute to the concentrations of these species (Seinfeld, 1986 Seinfeld and Pandis, 1998). 

In this section we study the interaction of a branch of electronic excitons with a mode of vibrations and phonons. The parameters in this model are the dispersion width 2B of the excitonic band, the average energy quantum hQ0 of the vibration, the coupling intensity, and the temperature. According to the ordering of these parameters, the system shows very different behavior, whose general treatment is beyond the scope of this section. We restrict ourselves to the usual cases that are relevant to the first singlet exciton of the anthracene crystal and to its absorption and emission mechanisms. 

---