| Autor: |
J. D. Fassett, F. E. Lytle, L. J. Moore, J. C. Travis |
| Rok vydání: |
1983 |
| Předmět: |
|
| Zdroj: |
International Journal of Mass Spectrometry and Ion Processes. 54:201-216 |
| ISSN: |
0168-1176 |
| Popis: |
Resonance ionization mass spectrometry (RIMS) has been used to study atom plumes produced by thermal vaporization. Experimental results are presented for the elements Fe, Ni, Mo and Re. Ion intensity vs. laser wavelength spectra consistently demonstrate that low-level energy states are significantly populated in the interaction volume of the mass spectrometer. The experimental results are explained by assuming a Boltzmann distribution of states for atoms leaving the heated surface. Since collisional relaxation does not occur in the high-vacuum thermal atom source and the transitions from the excited state to ground state are not radiatively allowed, the Boltzmann distribution of states is maintained in the atom plume. Since many elements possess low-level energy states, both spectroscopic sensitivity and selectivity will be reduced. However, the greater number of intense lines per element allows an increased range of elements to be studied by RIMS in a given wavelength region and opens the possibility of multielement capabilities. The implications for more energetic atomization techniques such as ion sputtering or laser ablation are discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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