VUV excitation

In the case of PMMA, for example, VUV excites electrons localized along the polymer backbone as well as those in the side chain, while UV excites only the r electrons in the side chain. The absorption coefficient in the VUV region is more than several... 

Wegh et al. (2001) studied the Nd3+ emission spectra for several phosphate and borate systems upon VUV excitation of the 4f25d levels. They observed 4f25d 4f3 fluorescence from... 

Studying the VUV excitation and corresponding emission properties of the YBOaiEu NCs, Wei and coworkers also revealed that as the particle size decreased, the excitonic transfer (ET) and CT bands showed a blue-shift and red-shift, respectively. At the same time, the spectral lines of the CT and borate absorption (BA) bands are narrowed. And BA /CT is decreased, while ET/CT exhibited an increase followed by a decrease. What is more interesting is that a peak located at 130 nm was present (Wei et al., 2003b). 

Such down-conversion phosphors are needed for energy efficient Hg-free lamps, which are driven by a Xe/Ne discharge. In order to establish f-f transitions with VUV-excitation and to avoid band-to-band absorption by the host lattice, large band-... 

ArF laser photolyis of H2S seeded in free-jet expansion of Ar used to form Sj. Analysis of LIF spectrum Lifetimes for two vib-rotational levels of Te2(A0 ). Cross-sections for deactivation by Tej Laser emissions from different excited Tcj isotopes Quantum yields for CI2 luminescence at wavelengths 308 nm following VUV excitation in the presence of Ar, Kr, and Xe f Three bound-free transitions observed in LIF from Brj following excitation at 158 nm. Collisional transfer by SF, N2, and He t Near-dissociation behaviour of l2(B n ) tLIF-Fourier transform study of the "near-dissociation behaviour of IjfBO I). Precise value for the well depth of the X state determined... 

Higher-order processes contribute in both the excitation of the core electron and relaxation of the core hole. These multi-electron processes are significant because of the strong perturbation caused by the creation or the annihilation of a core hole. In these processes, additional electrons are excited (shake-up) or ionized (shake-off). Two electron processes, double autoionization and double Auger decay, were mentioned above. The final states reached in core hole decay may be excited states and also may autoionize. It is clear that excitation of a core electron and the relaxation of the core hole provide many paths leading to multiple-electron excited states. These states have a unique chemistry relative to the single-electron excited states produced by arc lamp, laser, or vacuum ultraviolet (VUV) excitation. 

SYNTHESIS AND PHOTOLUMINESCENCE OF GREEN-EMITTING X2-(Y,Gd)2SiOs Tb3+ PHOSPHOR UNDER VUV EXCITATION... 

Amans, D., Belsky, A., Dujardin, C. et al. 2010. Time-resolved VUV excited luminescence of YjOj-Yb nanoparticles. IEEE Transactions on Nuclear Sciences 57 1355-1360. 

Ledoux, G., Mercier, B., Louis, C., Dujarding, C., TUlement, O., Perriat, P. 2004. Synthesis and optical characterization of Gd203 Etf+nanocrystals Surface states and VUV excitation. Radiation Measurements... 

Yadav RS, Pandey SK, Pandey AC (2010) Blue-shift and enhanced photoluminescence in BaMgAlioOiy Eu " nanophosphor under VUV excitation Iot PDPs application. J Rare... 

Luminescent Properties BaAli20i9 Mn has an intense and broad and excitation band in the region of 100 to approximately 200 nm. Under VUV excitation, this phosphor exhibits intense green-light emission with high luminescent color purity, and its emission spectrum shows a narrow band with peak wavelength at approximately 515 nm and FWHM approximately of 30 nm. 

Luminescent Properties The excitation band of Zn2Si04 Mn is very broad in the region of 100 to approximately 300 nm. Under VUV excitation, the emission spectrum shows an intense green emission with peak at approximately 525 nm, which corresponds to the " Tj transition of the Mn " " ion. 

Gao H, Wang Y (2007) Preparation of (Gd, Y)A103 Eu by citric-gel method and their photoluminescence under VUV excitation. J Lumin 122 997... 

Quantum cutting based on the fourth concept is demonstrated in a combination of Er VGd /Tb in LiGdF4 [31]. Figure 16.14 shows flie simplified energy-level diagram of the Er k-Gd -Tb system. In this model, on VUV excitation in the Af 5d levels of Ei % part of the excitation energy is transferred to Gd by... 

Fig. 16.68 Emission spectra of the main vacuum ultraviolet (VUV)—excited phosphors...

Table 16.11 Emission efficiency and colorcooidinates of the main VUV excited phosphors...

G. J. Bengtsson, P. Jonsson, J. Leu sson, S. Svanberg Time-resolved spectroscopic studies of the 7p P states of neutral silver following VUV excitation, Z. Physik D 22, 437 (1991)... 

Fig. 10.5 Schemes for resonance molecular photoionization via high-lying vibrational states by way of multiphoton resonance vibrational excitation with IR laser radiation (a) multiphoton IR + VUV excitation, (b) IR multiphoton excitation, and (c) IR multistep + VUV excitation.

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