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Department of Physics

Daniel Rolles

Daniel RollesAssociate Professor
327 Cardwell Hall
(785) 532-1615
Group Webpage

Ph.D. (Dr. rer. nat.) Technische Universität Berlin, 2005
M.Sc. (Diplom) Technische Universität Berlin, 2001

Research Area

Experimental Atomic, Molecular & Optical Physics; Ultrafast X-Ray Science

Taking a movie of a chemical reaction with atomic resolution? Watching the making and breaking of chemical bonds in real time? Using experimental techniques such as femtosecond time-resolved photoelectron spectroscopy and diffraction, time-resolved ion momentum imaging, and electron-ion coincidence spectroscopy, my research focuses on visualizing nuclear and electronic dynamics during photoionization and other photochemical reactions in gas-phase molecules by means of femtosecond pump-probe experiments. Our experiments combine lab-based studies using intense few-cycle optical lasers and their high-order harmonics in the XUV domain with intense and short-pulse VUV and X-ray radiation from Free-Electron Lasers, e.g. the Linac Coherent Light Source (LCLS) at Stanford, FLASH in Hamburg, Germany, and SACLA in Japan. This is complemented by electron-ion coincidence experiments and spectroscopy with 3rd generation synchrotron sources such as the Advanced Light Source (ALS) in Berkeley and PETRA III in Hamburg, Germany.

Research Support

  • Department of Energy
  • National Science Foundation

Recent Selected Publications

S. Pathak, L.M. Ibele, R. Boll, C. Callegari, A. Demidovich, B. Erk, R. Feifel, R. Forbes, M. Di Fraia, L. Giannessi, C.S. Hansen, D.M.P. Holland, R.A. Ingle, R. Mason, O. Plekan, K.C. Prince, A. Rouzée, R.J. Squibb, J. Tross, M.N.R. Ashfold, B.F.E. Curchod, and D. Rolles, Tracking the ultraviolet-induced photochemistry of thiophenone during and after ultrafast ring opening, Nat. Chem. (2020); DOI: 10.1038/s41557-020-0507-3.

G. Kastirke, M. S. Schöffler, M. Weller, J. Rist, S. Eckart, K. Fehre, S. Grundmann, A. Hartung, M. Hofmann, C. Janke, M. Kircher, D. Trabert, I. Vela-Perez, G. Nalin, N. Melzer, N. Anders, A. Pier, N. Strenger, J. Siebert, M. Kunitski, R. Dörner, A. Gatton, J. B. Williams, Th. Weber, X. Li, A. Rudenko, D. Rolles, B. Erk, R. Wagner, V. Music, N. Rennhack, J. Montaño, Y. Ovcharenko, P. Ziolkowski, D. E. Rivas, T. M. Baumann, P. Schmidt, P. Grychtol, M. Ilchen, A. De Fanis, T. Mazza, R. Boll, L. Ph. H. Schmidt, A. Czasch, F. Trinter, M. Meyer, K. Ueda, Ph. V. Demekhin, T. Jahnke, Photoelectron diffraction imaging of a molecular break-up using an X-ray free-electron laser, Phys. Rev. X 10, 021052 (2020).

 N. Berrah, A. Sanchez-Gonzalez, Z. Jurek, R. Obaid, H. Xiong, R. J. Squibb, T. Osipov, A. Lutman, L. Fang, T. Barillot, J. D. Bozek, J. Cryan, T. Wolf, D. Rolles, R. Coffee, K. Schnorr, S. Augustin, H. Fukuzawa, K. Motomura, N. Niebuhr, M. Guehr, L. J. Frasinski, R. Feifel, C-P. Schulz, K. Toyota, S.-K. Son, K. Ueda, T. Pfeifer, J.P. Marangos, and R. Santra, Femtosecond-resolved observation of the fragmentation of buckminsterfullerene following X-ray multiphoton ionization, Nature Physics 15, 1279–1283 (2019).

U. Ablikim, C. Bomme, T. Osipov, H. Xiong, R. Obaid, R. Bilodeau, N. G. Kling, I. Dumitriu, S. Augustin, S. Pathak, K. Schnorr, D. Kilcoyne, N. Berrah, and D. Rolles, A Coincidence Velocity Map Imaging Spectrometer for Ions and High-Energy Electrons to Study Inner-Shell Photoionization of Gas-Phase Molecules, Rev. Sci. Instr. 90, 055103 (2019).

L. Inhester, L. Greenman, A. Rudenko, D. Rolles, and R. Santra, Detecting coherent core-hole wave-packet dynamics in N2 by time- and angle-resolved inner-shell photoelectron spectroscopy, J. Chem. Phys. 151, 054107 (2019). 

Y. Malakar, W.L. Pearson, M. Zohrabi, B. Kaderiya, Kanaka Raju P., F. Ziaee, S. Xue, A.T. Le, I. Ben-Itzhak, D. Rolles, and A. Rudenko,  Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane, Phys. Chem. Chem. Phys. 21, 14090-14102 (2019).