1. Group IV presentation: Frímann, Helgi, Long & Nanna

2.  Resonance enhanced multi-photon ionization.  Spectroscopic tecnique applicable for atoms and small molecules  Accesses excited intermediate states  Two or three photon aborbance via LASER excitation  Rydberg states

3. HCl* HCl + H + + Cl (i) (ii) (1) (2)(2) (3)(3) (4)(4) number of photons: H * +Cl H+H+ H+ Cl* Cl + (v)(vi) (iii)(iv) H + Cl - (2)

4. out Voltage devider HV - 2Kv HX nozzle Turbo Pump TOF lense MCP detector oscilloscope computer Excimer Laser In út Dye- Laser SHG Time delay 200-1200  S laser control Pellin Broca prism SHG control In REMPI- TOF

5. IonMassFlight time [µs] H+H+ 10,945 35 Cl + 355,591 H 35 Cl + 365,670 37 Cl + 375,748 H 37 Cl + 385,826

11. H+H+ 35 Cl + H 35 Cl + 37 Cl + H 37 Cl + Impurity

14. H 37 Cl + E 1  + (0 + )(0,0)X 1  + (0 + )

15. 01234567 210 O Q 35 Cl + 37 Cl + E 1  + (0 + )(0,0)X 1  + (0 + )

16. Q O H+H+ 2 1 0 1 2 4 5 6 7 0 3 E 1  + (0 + )(0,0)X 1  + (0 + )

17. J X 1  + (0 + ) cm -1 E 1  + (0 + )(0,0) 0083780.1 120.8775122483793.04279 262.6197701683819.02764 3125.201240683857.76486 4208.58362483908.85531 5312.71585483970.81229 6437.534097884047.26309 7582.961756284137.93709 Energy level