List of Publications
[2002]
O. Hemmers, M.
Blackburn, T. Goddard, P. Glans, H. Wang, S.B. Whitfield, R. Wehlitz, I.A.
Sellin, and D.W. Lindle:
Dipole and Nondipole Angular-Distribution Effects in the Valence
Photoemission of Neon
J. Electron Spectrosc. Relat. Phenom. 123, 257 (2002).
B. Krässig, E.P. Kanter, S.H. Southworth, R. Guillemin, O.
Hemmers, D.W. Lindle, R. Wehlitz, and N.L.S. Martin:
Photoexcitation of a Dipole-Forbidden Resonance in Helium
Phys. Rev. Lett. 88, 203002 (2002).
R. Guillemin, O.
Hemmers, D.W. Lindle, K. Le Guen, D. Ceolin, C. Miron, N. Leclercq, P.
Morin, M. Simon, and P.W. Langhoff:
Non-Dipolar Electron
Angular Distributions from Fixed-in-Space Molecules
Phys. Rev. Lett. 89, 022002 (2002)
Exploring the Limits
of the Dipole Approximation with Angle-Resolved Electron Time-of-Flight
Spectrometry
(accepted by DOE Student paper)
D.L. Hansen, W.C. Stolte, O. Hemmers, R. Guillemin, and D.W. Lindle:
Anion formation moderated by
post-collision interaction following core-level photoexcitation of CO
J. Phys. B 35, L381 (2002)
[2001]
P.W. Langhoff, J.C. Arce, J.A.
Sheehy, O. Hemmers, H. Wang, P.
Focke, I.A. Sellin, and D.W. Lindle:
On the angular
distributions of electrons photoejected from fixed-in-space and randomly
oriented molecules
J. Electron Spectrosc. Relat. Phenom. 114-116, 23 (2001)
H.S. Chakraborty, D.L. Hansen, O. Hemmers, P.C. Deshmukh, P. Focke, I.A. Sellin, C. Heske, D.W.
Lindle, and S.T. Manson:
Interchannel coupling in the
photoionization of the M-shell of Kr well above threshold: Experiment and
Theory
Phys. Rev. A 63, 042708 (2001)
W.C. Stolte, D.L. Hansen, M.N. Piancastelli, I. Dominguez
Lopez, A. Rizvi, O. Hemmers, H.
Wang, A.S. Schlachter, M.S. Lubell, and D.W. Lindle:
Anionic Photofragmentation of CO: A
Selective Probe of Core-Level Resonances
Phys. Rev. Lett. 86, 4504 (2001)
O. Hemmers,
S.T. Manson, M.M. Sant'Anna, P. Focke, H. Wang, I.A. Sellin, and D.W. Lindle:
Relativistic effects
on interchannel coupling in atomic photoionization: the photoelectron angular
distribution of Xe 5s
Phys. Rev. A 64, 022507 (2001)
D.W. Lindle and O.
Hemmers:
Time-of-Flight Photoelectron Spectroscopy
of Atoms and Molecules
J. Alloys Comp. 328, 27 (2001)
H. Wang, G. Snell, O.
Hemmers, M.M. Sant'Anna, I.A. Sellin, N. Berrah, D.W. Lindle, P.C.
Deshmukh, N. Haque, and S.T. Manson:
Dynamical relativistic
effects in photoionization: Spin-orbit-resolved angular distributions of xenon
4d photoelectrons
near the Cooper minimum
Phys. Rev. Lett. 87, 123004
(2001)
J.C. Arce, J.A. Sheehy, P.W. Langhoff, O. Hemmers, H. Wang, P. Focke, I.A.
Sellin, and D.W. Lindle:
On the Angular
Distributions of Molecular Photoelectrons: Dipole Cross Sections for
Fixed-in-Space and Randomly Oriented Molecules
Chem. Phys. Lett. 346, 341 (2001);
Erratum 349, 349 (2001)
O. Hemmers, H. Wang, P. Focke, I.A. Sellin, D.W.
Lindle, J.C. Arce, J.A. Sheehy, and P.W. Langhoff:
Large Nondipole Effects in the Angular Distributions of K-Shell
Photoelectrons from Molecular Nitrogen
Phys. Rev. Lett. 87, 273003 (2001).
[2000]
A. Derevianko, O. Hemmers,
S. Oblad, P. Glans, H. Wang, S.B. Whitfield, R. Wehlitz, I.A. Sellin, W.R.
Johnson, and D.W. Lindle:
Electric-octupole and pure-electric-quadrupole effects in soft x-ray
photoemission
Phys. Rev. Lett. 84, 2116 (2000).
[1999]
O. Hemmers, F. Heiser,
J. Viefhaus, K. Wieliczek and U. Becker:
Angle-resolved resonant Auger electron spectroscopy of CO after
vibrational-resolved C 1s -> nll excitations
J. Phys. B 32, 3769 (1999).
D.L. Hansen, O. Hemmers, H. Wang, D.W. Lindle, P.
Focke, I.A. Sellin, C. Heske, H.S. Chakraborty, P.C. Deshmukh, S.T. Manson:
Validity of the independent-particle approximation in x-ray photoemission:
The exception, not the rule
Phys. Rev. A 60, R2641 (1999).
D.W. Lindle and O. Hemmers:
Breakdown of the Dipole Approximation in Soft-X-Ray Photoemission
J. Electron Spectrosc. Relat. Phenom. 100, 297 (1999).
[1998]
D.L. Hansen, M.E. Arrasate, J.
Cotter, G.R. Fisher, O. Hemmers, K.T. Leung, J.C. Levin, R. Martin, P.
Neill, R.C.C. Perera, I.A. Sellin, M. Simon, Y. Uehara, B. Vanderford, S.B.
Whitfield, and D.W. Lindle:
Photofragmentation of third-row hydrides following photoexcitation at
deep-core levels
Phys. Rev. A 58, 3757 (1998).
O. Hemmers, S.B. Whitfield, P. Glans, H. Wang,
D.W. Lindle, R. Wehlitz, and I.A. Sellin:
High-resolution electron time-of-flight apparatus for the soft-x-ray region
Rev. Sci. Instrum. 69, 3809 (1998).
[1997]
D. W. Lindle, O. Hemmers, P. Glans, D. L. Hansen,
H. Wang, S. B. Whitfield, R. Wehlitz, J. C. Levin, I. A. Sellin, R. C. C.
Perera:
The X-Ray Atomic and Molecular Spectroscopy Program at the Advanced Light
Source
Indian J. Phys. 71B, 325-334 (1997).
O. Hemmers, G. Fisher, P. Glans, D. L. Hansen, H.
Wang, S. B. Whitfield, D. W. Lindle, R. Wehlitz, J. C. Levin, I. A. Sellin, R.
C. C. Perera, E. W. B. Dias, H. S. Chakraborty, P. C. Deshmukh, and S. T.
Manson
Beyond the dipole approximation: angular-distribution effects in valence
photoemission
J. Phys. B 30, L727-L733 (1997).
W. C. Stolte, Y. Lu, J. A. R. Samson, O. Hemmers,
D. L. Hansen, S. B. Whitfield, H. Wang, P. Glans, and D. W. Lindle
The K-shell Auger decay of atomic oxygen
J. Phys. B 30, 4489-4497 (1997).
E. W. B. Dias, H. S. Chakraborty, P. C. Deshmukh, S. T.
Manson, O. Hemmers, P. Glans, D. L. Hansen, H. Wang, S. B. Whitfield, D.
W. Lindle, R. Wehlitz, J. C. Levin, I. A. Sellin, and R. C. C. Perera
Breakdown of the Independent Particle Approximation in High-Energy
Photoionization
Phys. Rev. Lett. 78, 4553-4556 (1997).
O. Hemmers, P. Glans, D. L. Hansen, H. Wang, S. B.
Whitfield, D. W. Lindle, R. Wehlitz, J. C. Levin, I. A. Sellin, R. C. C.
Perera:
Photoelectron Spectroscopy and the Dipole Approximation
Synch. Rad. News, Vol. 9, No. 6, 40-45 (1996); Errata Vol. 10,
No. 3, 21 (1997).
R. Wehlitz, I. A. Sellin, O. Hemmers, S. B.
Whitfield, P. Glans, H. Wang, D. W. Lindle, B. Langer, N. Berrah, J. Viefhaus,
and U. Becker:
Photon energy dependence of ionization-excitations in helium at medium
energies
J. Phys. B 30, L51-L58 (1997).
[1996]
N. Berrah, B. Langer, J. D. Bozek, T. Gorczyca, O.
Hemmers, D. W. Lindle, and O. F. Toader:
Angular-distribution parameters and R-matrix calculations of Ar 3s-1-->np resonances
J. Phys. B 29, 5351-5365 (1996).
W. Ng, G. Jones, R. C. C. Perera, D. Hansen, J. Daniels, O.
Hemmers, P. Glans, S. B. Whitfield, H. Wang, and D. W. Lindle:
First Results from the High-Brightness X-Ray Spectroscopy Beamline at ALS
Rev. Sci. Instr. 67, (9) (1996).
Norio Saito, Franz Heiser, Oliver Hemmers, Kornel
Wieliczek, Jens Viefhaus, and Uwe Becker:
Kinetic-energy- and angular-resolved fragmentation of CO in
vibrational-resolved C1s excitation
Phys. Rev. A 54, 2004-2010 (1996).
B. Langer, N. Berrah, A. Farhat, O. Hemmers, and
J. D. Bozek:
Auger resonant Raman spectroscopy used to study the angular distributions of
the Xe 4-->6p decay spectrum
Phys. Rev. A 53, R1946-R1949 (1996).
[1995]
O. Hemmers, S. B. Whitfield, N. Berrah, B. Langer,
R. Wehlitz, and U. Becker:
Angular distributions of the C(1s) photoelectron satellites in CO
J. Phys. B: 28, L693-L700 (1995).
T. Liebsch, O. Plotzke, F. Heiser, U. Hergenhahn, O.
Hemmers, R. Wehlitz, J. Viefhaus, B. Langer, S. B. Whitfield, and U.
Becker:
Angle-resolved photoelectron spectroscopy of
Phys. Rev. A 52, 457-464 (1995).
N. Saito, F. Heiser, O. Hemmers, A. Hempelmann, K.
Wieliczek, J. Viefhaus, and U. Becker:
Vibrational-state-dependent decay of the CO C(1s) excitation
Phys. Rev. A 51, R4313-R4316 (1995).
B. Langer, J. Viefhaus, O. Hemmers, A. Menzel, R.
Wehlitz, and U. Becker:
Observation of parity-unfavored transitions in the nonresonant
photoionization of argon
Phys. Rev. A 51, R882-R885 (1995).
[1994]
O. Hemmers, F. Heiser, J. Eiben, R. Wehlitz, and
U. Becker:
Variation of the C(KVV) Auger angular distribution in the C(1s) 
*-resonance of CO
Nucl. Instrum. Methods B87, 209-214 (1994)
[1993]
O. Hemmers, Korrelationseffekte in kleinen
Molekülen. Vol. 3 in the series studies of vacuum ultraviolet and x-ray
processes, edited by U. Becker, (AMS Press, New York, 1993).
O. Hemmers, F. Heiser, J. Eiben, R. Wehlitz, and
U. Becker:
Observation of Nonisotropic Auger Angular Distribution in the C(1s) Shape
Resonance of CO
Phys. Rev. Lett. 71, 987-990 (1993).
U. Becker, O. Hemmers, B. Langer,
Multiplet-changing Auger transitions in valence double photoionization
Phys. Rev. A 47, R767-R770 (1993).
[1992]
U. Becker, O. Hemmers, B. Langer, A. Menzel, R.
Wehlitz, and W. B. Peatman:
Evidence for atomic processes in molecular valence double ionization
Phys. Rev. A 45, R1295-R1298 (1992).
[1991]
R. Wehlitz, F. Heiser, O. Hemmers, B. Langer, A.
Menzel, and U. Becker:
Electron-Energy and -Angular Distributions in the Double Photoionization of
Helium
Phys. Rev. Lett. 67, 3764-3767 (1991).
B. Langer, J. Viefhaus, O. Hemmers, A. Menzel, R.
Wehlitz, and U. Becker:
High-resolution photoelectron spectrometry study of conjugate shakeup
processes in the Li 1s threshold region
Phys. Rev. A 43, Rap. Comm. 1652-1655 (1991).
[1989]
U. Becker, R. Wehlitz, O. Hemmers, B. Langer, and
A. Menzel:
Observation of Participator Auger Decay following Valence Photoionization
with Excitation
Phys. Rev. Lett. 63, 1054-1057 (1989).
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Last updated on November-12-2002.
