1. TWO-PHOTON IONIZATION OF SILVER CLUSTERS V.Paployan, K.Madoyan, A.Melikyan, Russian-Armenian (Slavonic) State University, Yerevan, Armenia H.Minassian Yerevan Physics Institute, after A. Alikhanian, Yerevan, Armenia 1

2. Two-photon ionization (TPI) of metal clusters Ultrahigh sensitivity of TPI can be used: shape, rotational and vibrational temperatures of the clusters with high accuracy optical power limiting nanolithography biosensing 2

3. 1. D. Bohm, D. Pines, Phys. Rev. 1953 2. I.E. Protsenko, A.V. Uskov, Physics-Uspekhi 2012 3

4. Pump and Probe Electric Field Strengths 4

5. Enhancement of Pump Wave 5

6. Approximations 6

7. TPI Probability 7

8. Enhancement factors 8

9. Internal field enhancement of the pump wave 9

10. Quality factor 10

11. Conclusion Surface plasmon assisted probability of TPI in SC is 400 times stronger as compared to the case when SP resonance is absent High quality factor of TPI process Q ~ 75 11

12. THANK YOU FOR ATTENTION 12