The Journal of Chemical Physics, 15 July 1980, Vol.73(2), pp.664-672
Secondary photon emission due to ion bombardment of Be metal foil by 200–3000 eV Kr + , Ar + , Ne + , O + 2 , and N + 2 was studied and the emission yield from four Be (I) and one Be (II) transitions as a function of incident ion energy was interpreted in terms of relevant excitation processes. A model based on a velocity dependent excitation process, the random linear collision cascade theory of sputtering; and making allowance for nonradiative de‐excitation of the excited sputtered atoms and/or ions, accounted for the observed energy dependent emission yields. The results of this model indicate that the secondary photon emission yield, Y ex i ( v m ), of a given emission line, i , can be expressed as Y ex i ( v m ) α J (μamp/cm 2 ) S (no./ion) exp[−( A / a ) i / v m ], where J is the incident ion current density, S the sputtering yield; v m is the velocity corresponding to the maximum transferred energy between the incident ion of energy E 1 , mass M 1 , and the target atom of mass M 2 , i.e., v m =[8 M 1 E 1 /( M 1 + M 2 ) 2 ] 1/2 ; ( A / a ) i is the effective nonradiative de‐excitation parameter for state i . Values for the ( A / a ) i parameters were found to be 1–3×10 7 cm/sec for the Be (I) and Be (II) states; a decrease to 5–7×10 6 cm/sec upon O + 2 bombardment was observed for the Be (I) states, while the value for the Be (II) state did not change.
Classical And Quantum Mechanics, General Physics ; Argon Ions ; Collisions ; Beryllium ; Ion Collisions ; Krypton Ions ; Neon Ions ; Nitrogen Ions ; Oxygen Ions ; Emission Spectra ; Energy Dependence ; Energy-Level Transitions ; Ev Range 100-1000 ; Excitation ; Kev Range 01-10 ; Secondary Emission ; Alkaline Earth Metals ; Charged Particles ; Elements ; Emission ; Energy Range ; Ev Range ; Ions ; Kev Range ; Metals ; Spectra ; 640301 - Atomic, Molecular & Chemical Physics- Beams & Their Reactions;