Metastable argon reactions

Our speculation is further strengthened by the fact that energy transfer from the excited metastable argon atom to neutral methanol is quite facile. Tao et al. (1987) have reported such reactions ... 

Another type of reaction that may be used to create reactants is the collisional dissociation of a molecule by some electronically excited species, usually an inert gas atom [28]. Uranium atoms have been generated [29] by the collisional dissociation of uranocene by metastable argon atoms. This is an attractive alternative to the problems associated with the vaporisation of uranium. 

The emission spectrum from electronically excited CS, produced by energy-transfer reactions of metastable argon atoms with CSa, COS, and CSClg, has been measured in a careful analysis of the spectrum so obtained, several new bands were noted. 

Laser-induced, collision-induced, and metastable decomposition reactions of the larger cluster ions were examined with a triple-quadrupole mass spectrometer. Various phenomena observed during the decomposition of the clusters suggested four kinds of energy storage thermal, vibrational [N2(v=1)], electronic, and chemical. In smaller clusters (n<9) containing argon in the inner shell, two moles of N2 are lost via the reaction Ar+N N2 +ArNj, which is indicative for the chemical metastability of these clusters [36]. 

Moore et al. (2004) reported on the use of metastable atom bombardment (MAB) ionization and HRMS in the positive ion mode for the detection of CPs [34]. Using an inert gas like argon, MAB ionization generates ions via an electrophilic reaction of a metastable atom with the analyte of interest. Figure 10 shows a comparison of ECNI and positive ion MAB mass spectra. 

A very satisfactory approach for studies of Cl atom reactions uang resonance absorptimi is based on a O-atom resonance lamp onffloying argon Ar P2.0 metastables. This utilizes the reactive collision of Ar P2,o atoms with Q2, which occurs with a hi cross ection (k = 7.1 x 10, and gives ArQ excimers (see Chapter 4 of this volume) vidiicli predissodate to Cl (4r) excited atoms - ... 

New data concerning the interaction of ions and hydrocarbon radicals allow to have a quite complete mapping of the relevant reaction rates in an Ar/CH4 plasma by now and it is possible to investigate the effect of the chemical kinetics in such a system and eventually to identify the gaseous precursor of the chemical species incorporated in the deposited film. We have modeled the gas-phase chemistry of a typical radio frequency CH4/ Ar plasma used for the deposition of diamond and diamond-like carbon films, with the aim of understanding the effects of the chemical kinetics of argon ions and metastables. 

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