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Summary of experiments analyzing ionization of HCl molecule in the E(0.2) Q-branch peak using integrated mass peak areas and energy data. Findings indicate consistent ionization mechanism requiring 3 photons. Similar conclusions drawn for E(0.3)–E(0.8) and E(1.0)–E(1.5) Q-branch peaks. Detailed analysis presented through tables, figures, and conclusions.
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Summary of experiments for the “low” energy ionisation of HCl in the E(0.2) Q-branch peak.
Table 1 shows integrated area of respective mass peaks vs. energy of laser pulse. Table 2 shows ln values of the area and energy in table 1.
Figure shows the ln of the change in area with energy. The results show that there is still some degree of saturation, although it seems as if the ionisation for all the masses need the same amount of photons for ionisation.
Figure shows the total mass peaks for six different energy values, see first figure for those values
Figure shows the H+ peaks that have been normalised for the HCl+ mass peak height. Difficult to evaluate change from intensity only, integration shows a slow increase of area with energy.
Figure shows Cl+ and HCl+ peaks that have been normalised for the HCl+ mass peak height. Cl+ and HCl+ seem to change indentically with energy. Integration shows a slow increase of area with energy.
Figure shows the integrated area of the normalised mass peaks and the respective energy of the laser pulses.
Table shows ratios of the mass peaks for the areas before normalisation. Table shows ratios of the mass peaks for the areas after normalisation.
Conclusion • Assuming that there is not much saturation for these energy values the ionisation mechanism uses only 3 photons to produce the ions. • Everything points to the fact that all the mass peaks use the same amount of photons for ionisations, namely three ( or possibly four if there is still some degree of saturation).
Summary of experiments for the ionisation of HCl in the E(0.3) – E(0.8) Q-branch peaks.
Figure shows the H+ peaks that have been normalised for the HCl+ mass peak height. H+ and HCl+ peaks seem to change indentically with energy.
Figure shows Cl+ and HCl+ peaks that have been normalised for the HCl+ mass peak height. Cl+ and HCl+ seem to change indentically with energy.
Figure shows the mass peaks of Cl+ and HCl+, normalised to HCl+ for the E(0.3) – E(0.8) Q-branch peaks. There seems to be no change with different J.
Figure shows the mass peaks of H+ , normalised to HCl+ for the E(0.3) – E(0.8) Q-branch peaks. There seems to be some change with different J. Topmost black and green lines are J’=6-7. With J’= 3-5 bunched below. Change is still relatively small.
Conclusion • As with the earlier conclusion, everything points to the fact that the ionisation mechanisms use the same number of ions. • There also seems to be no significant change in the mass ratios with J. • In the case of E(1.0) – E(1.5) Q branch there is a significant change in the mass ratios. See file HClmass E(1)state Q0-5.pxp
Summary of experiments for the ionisation of HCl in the E(1.0) – E(1.5) Q-branch peaks.
Figures show the H+, Cl+ and HCl+ mass peaks normalised to HCl+. Like in E(0.2) there is no apparent change in the mass peak ratios with changes in energy.
Figure shows the mass peaks for different J values, ranging from 0 to 5 from left to right. There are obvious changes with J values.
