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Robert E. Wagner Sophomore Intense Laser Physics Theory Unit Illinois State University Cycloatoms and high order harmonics in moderate intense laser fields Support: NSF, Res. Corp., and ISU Honors Program

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Laser Magnetic field Relativity without super-strong lasers?

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Maximum speed v/c for each non- relativistic LL R.E. Wagner, Q. Su and R. Grobe, Phys. Rev. Lett. 84, 3282 (2000).

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Non-relativisticRelativistic Orbits stay in phase Orbits dephase relativistically Time (in 2 L 75 150 500 0 y x

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Cycloatom dynamics = L

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relativistic (exact)dephasing model Time 75 150 500 0 Relativistic dephasing model replace (V 0 )

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Steady state spatial electron distributions Multiple resonances Fractional resonances ≈ 1/2 L ≈ 1/3 L ≈ L ≈ 2 L ≈ 3 L P.J. Peverly, R.E. Wagner, Q.Su and R. Grobe, Las. Phys. 10, 303 ( 2000). Q. Su, R.E. Wagner, P.J. Peverly, and R. Grobe, Front. Las. Phys. p. 117-123 (Springer, 2000).

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Cycloatom dynamics =1/2 L

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Scattered light spectra non-relativistic relativistic R.E. Wagner, et al, PRA 60, 3233 (1999)

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Quantum Mechanical Cycloatoms? Dirac Liouville J. Braun, Q. Su and R. Grobe, PRA 59, 604 (1999) P. Peverly, R. Wagner, Q. Su and R. Grobe, Las Phys. 10, 303 (2000)

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Dirac Liouville Confirmed: Dirac Cycloatoms P. Krekora, R. Wagner, Q. Su and R. Grobe, PRA, submitted

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Summary Cycloatoms reveal new relativistic phenomena Novel resonances => possible experiments [1] R.E. Wagner, Q. Su and R. Grobe, Phys. Rev. Lett. 84, 3282 (2000). [2] R.E. Wagner, Q. Su, and R. Grobe, Phys. Rev. A 60, 3233, 1999. [3] R.E. Wagner, P.J. Peverly, Q. Su and R. Grobe, Phys. Rev. A 61, 35402(2000). [4] P.J. Peverly, R.E. Wagner, Q.Su and R. Grobe, Las. Phys. 10, 303 ( 2000). [5] P. Krekora, R.E. Wagner, Q. Su and R. Grobe, PRA, submitted. [6] Q. Su, R.E. Wagner, P.J. Peverly, and R. Grobe, Front. Las. Phys. p. 117-123 (Springer, 2000). www.phy.ilstu.edu/ILP U ndergraduate S tudent travel grant ( DAMOP )

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