Photo-assisted technique

The trivial observation that computer monitors can be programmed to display millions of different colours has led to the development of an experimental technique based on the simultaneous use of a standard computer screen as a controlled light source, and a digital camera, such as a web camera, as an imaging detector for the evaluation of diverse optical properties of chemically sensitive substances. The first demonstration of this concept was published back in 2003 [28], and the technique was nicknamed as Computer Screen Photo-assisted Technique (CSPT). 

Pilippini D, Di Natale C, Paolesse R, D Amico A, Lundstrom I (2007) Computer screen photo-assisted techniques for global monitoring of environmental and sanitary parameters. Sens Actuators B 121 93-102... 

In this chapter, the research progress in the embossing, molding and photo-assisted techniques for micropatterning is reviewed, and several practical applications ofthe sol-gel... 

PHOTO-ASSISTED TECHNIQUE Research Progress in Photo-Assisted Technique... 

Photo-assisted CVD of AI2O3 from AlMe3 has been reported to provide very high growth rates (2000 A min" ) and give films with electrical properties comparable to films deposited using thermal or plasma techniques [95]. Irradiation with a 248 nm... 

It may be necessary to make visual measurements or observations within the confines of the test vessel. Additionally, it may be necessary to introduce radiation mto the test vessel to produce reactions on metal surfaces as in the case of photo-assisted chemical or electrochemical reactions or for conducting analytical techniques such as Raman Spectroscopy. 

The same group also studied the effect of visible-light irradiation on the growth of CdTe films. It was found that both deposition current density and current efficiency for the CdTe electrodeposition were enhanced by photoirradiation and, as a result, the time required for a given amount of deposition was dramatically reduced. They called this technique photo-assisted electrodepositirMi [91]. 

A recently introduced technique for the separation of larger molecules is matrix-assisted faser Resorption-ionisation mass spectrometry (MALDI-MS). Developed by Karas et al. [4, 5] in 1988, it has been successfully used to determine the mass of biomolecules up to 500.000 Da. This method is based on the principle that the dissolved specimen is mixed with a matrix, and then crystallizes. After drying, a laser pulse is directed onto the solid matrix to photo-excite the matrix material,resulting in desorption and soft ionisation of the analyte.The molar mass is then determined by the lime ef ilight (TOF). 

---