Argon metastable

FLOW REQUIREMENTS. The carrier gases used are nitrogen or argon containing methane at 5 - 10% of the total volume. The methane reduces the concentration of metastable argon and promotes thermal equilibrium of the electrons. The ECD is/is not a flow-sensitive detector. Many believe that column bleed and traces of oxygen in the carrier gas are responsible for flow and temperature dependence. It is prudent to see if the system is dependent. 

The AEs measured by our group are consistent with an ionization mechanism which involves the creation of the excited metastable argon atom Ar(3P2j0) via electron impact. After generation of this Ar 4s state, its excitation energy may then be transferred to the methanol component of the heterocluster. The excitation energies for the formation of Ar 4s 3P2 0 states are 11.55 and 11.72 eV, respectively. 

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. 

The applications of the method as a clean source of molecular spectra have only now begun to be investigated, and it seems likely that in the future many new systems of simple molecules and radicals will be identified using impact of metastable argon atoms with suitable stable molecules. 

Touzeau, M. Pagnon, D. (1978). Vibrational excitation of N2(G) and N2(B) by metastable argon atoms and the determination of the branching ratio. Chem. Phys, Lett, Vol. 53,... 

Significant spin-orbit effects have also been observed in a number of the excited inert gas nonreactive collisional decay channels. In excitation transfer collisions between metastable argon and hydrogen atoms. 

Several groups have reported experimental realizations of an atomic mirror which were based upon the dipole force exerted by a surface plasmon wave. Specular reflection of a supersonic beam of metastable argon (Seifert et al. 1994) and metastable neon (Feron et al. 1993) has been demonstrated using a plasmon wave at a metal-vacuum interface. The enhancement of the laser field by plasmons increased the maximum reflected angle by a factor of 2 to 3. 

Seifert, W., Adams, C. S., Balykin, V. I., Heine, C., Ovchinnikov, Yu., and Mlynek, J. (1994). Reflection of metastable argon atoms from an evanescent wave. Physical Review A, 49, 3814-3823. 

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