See the list of publications that involve REU students
| In 2007 I have been the mentor of Bethany Reilly (Taylor University, Indiana). She investigated the double photoionization process of deuterated benzene C6H3D3 using an ion time-of-flight spectrometer. Because a previous investigation of the double photoionization of regular benzene was inconclusive, we were using deuterated benzene. Her analysis of the many spectra she took shows that it is possible to derive the carbon-carbon distance of the benzene ring from the double-to-single photoionization ratio but, in contrast to C60, not the diameter of the benzene ring. Again (as for the non-deuterated benzene) we could derive another distance from our data, which, however, can still not be related to any dimension of the benzene ring. Further investigations of this interesting effect are currently under way. |
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The photo on the top shows Bethany Reilly and Pavle Juranic analyzing their
spectra while taking more data.
The photo on the left shows Ralf Wehlitz and Bethany Reilly after Bethany's presentation of her research. (Click on a photo to magnify it.) |
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| In 2006 I have been the mentor of Max Young (University of Idaho). She investigated the double photoionization process of benzene using an ion time-of-flight spectrometer. Her analysis of the spectra shows that it is possible to derive the diameter of the benzene ring from the double-to-single photoionization ratio but, in contrast to C60, not the bond length between the carbon atoms. Surprisingly we could derive another distance from our data, which, however, can not be related to any dimension of the benzene ring. The investigations are still ongoing (see above) .... |
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The photo on the top shows Max Young at her experimental setup
refilling the liquid nitrogen trap.
The photo on the left shows Ralf Wehlitz, Max Young, and Pavle Juranic while taking time-of-flight ion-yield spectra of benzene. (Click on a photo to magnify it.) |
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In 2005, as in previous years (see below), I have participated in the
NSF sponsored REU
(Research Experience for Undergraduates) program as a mentor. This year I have been the mentor of Joni Nordberg (Gustavus Adolphus College, St. Peter, MN). She investigated the double photoionization process of sodium and potassium using an ion time-of-flight spectrometer. Her results demonstrate that a previously found scaling law is indeed applicable to Na and K. A paper with her results was published in Physical Review A in 2006 (see publication list below). |
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The photo on the top shows Joni Nordberg at the experimental setup
used for her investigations.
The photo on the left shows Ralf Wehlitz, Joni Nordberg, and Pavle Juranic after Joni's presentation of her research results at SRC. (Click on a photo to magnify it.) |
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As in the previous year (see below) I participated again in 2004 as a mentor in
the Research Experience for Undergraduates (REU) program at the Synchrotron Radiation
Center.
I have been the mentor of Kathleen ("Kat") Barger (Western Washington University,
Bellingham) who investigated the multiple photoionization of C60
using an ion time-of-flight spectrometer.
One paper with her results has been published in Physical Review Letters
and another one has been published in Physical Review A
(see the list of publications at
the end of this page.
The photo on the top shows Kat Barger working on the experimental setup during her experiment. The photo on the right shows Pavle Juranic, Kat Barger, and Ralf Wehlitz after Kat's presentation of her research results at SRC. (Click on a photo to magnify it.) |
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In summer of 2003 I participated as a mentor in the Research Experience for
Undergraduates (REU) program at the Synchrotron Radiation
Center. This program has two components. The first one involves students in
intensive research experience from formulating a research project to
conducting the research and presenting the findings. The second component involves
educational enrichment and social activities.
I have been the mentor of Marleen Martinez (Univ. of Washington,
Seattle) who conducted her research on the
double-photoionization process in lithium. Two corresponding papers have been published in Phys. Rev. A 69, 062709-1 - 062709-6 (2004) and in the Journal of Electron Spectroscopy and Related Phenomena 144-147, 59-62 (2005). |
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List of publications that involve REU students
R. Wehlitz, M. M. Martinez, J. B. Bluett, D. Luki´c, and S. B. Whitfield:
Double-to-Single Photoionization Ratio of Lithium at Medium Energies
Phys. Rev. A 69, 062709-1 - 062709-6 (2004)
[Abstract]
R. Wehlitz, J. Colgan, M.M. Martinez, J. B. Bluett, D. Luki´c, and
S.B. Whitfield:
Double Photoionization Processes in Lithium
J. Electron Spectrosc. Relat. Phenom. 144-147, 59-62 (2005)
[Abstract]
P. N. Jurani´c, D. Luki´c, K. Barger, and R. Wehlitz:
Experimental Evidence for Modulations in the Relative
Double-Photoionization Cross Section of C60 from Threshold up to
280 eV
Phys. Rev. Lett. 96, 023001-1 - 023001-4 (2006)
[Abstract]
P. N. Jurani´c, D. Luki´c, K. Barger, and R. Wehlitz:
Multiple Photoionization and Fragmentation of C60 in the
18-280-eV Range
Phys. Rev. A 73, 042701-1 - 042701-8 (2006)
[Abstract]
P. N. Jurani´c, J. Nordberg and R. Wehlitz:
Single and Double Photoionization Data of Na and K Corroborate
the Existence of an Universal Scaling Law for the Ratio
Phys. Rev. A 74, 042707-1 - 042707-7 (2006)
[Abstract]