Tom Kirchner's Personal Homepage
Dr. Tom Kirchner
Associate Professor of Physics
Department of Physics and Astronomy
York University
4700 Keele Street
Toronto, Ontario, M3J 1P3
Tel: (416) 7362100 ext 33695
Fax: (416) 7365516
tomk [at] yorku.ca


Teaching (2018/19)
PHYS 5000 : Quantum Mechanics I
PHYS 4011/5050 : Atomic and Molecular Physics
Previously, I also taught
PHYS 1410 ,
PHYS 3010 ,
PHYS 4010 ,
PHYS 6204 , and
PHYS 6208
at York.
You can find some info and lecture notes by clicking on the links above.
Research
My research is concerned with the question of how atomic and molecular
fewbody systems respond to perturbations exerted on them by impinging
particles and external fields. Such collision or laser field induced
quantum dynamics have implications for a variety of topics and applications
ranging from plasma diagnostics to radiation biology. What is more,
they constitute a problem of fundamental importance: How do the
building blocks of matter interact and evolve in space and time?
The better this question is answered the more is learned about a
further issue that receives considerable attention: Can fewbody
quantum dynamics be manipulated purposefully and controlled actively?
I have participated in a number of projects and activities to elucidate
these topics by theoretical analysis and computations. The approaches
used include density functional theory based methods to deal with the
manyelectron problem, and both nonperturbative and perturbative
quantum methods to describe the dynamics of the systems.
For the last few years, we have been
working on methods to describe ionization and
fragmentation of multicenter molecules. Applications are concerned
with, e.g., ioninduced fragmentation of water, which is a relevant process in
the radiation damage of biological tissue.
Selected papers on ionmolecule collisions

H. J. Lüdde, M. Horbatsch, and T. Kirchner,
A screened independent atom model for the description of ion
collisions from atomic and molecular clusters,
Eur. Phys. J. B 91, 99 (2018)

H. J. Lüdde, A. Achenbach, T. Kalkbrenner, H.C. Jankowiak, and
T. Kirchner,
An independentatommodel description of ionmolecule collisions
including geometric screening corrections,
Eur. Phys. J. D 70, 82 (2016)

H. Luna, W. Wolff, E. C. Montenegro, A. C. Tavares,
H. J. Lüdde, G. Schenk, M. Horbatsch, and T. Kirchner,
Ionization and electroncapture cross sections for single
and multipleelectron removal from H_{2}O by
Li^{3+} impact, Phys. Rev. A 93 052705 (2016)

T. Kirchner, M. Murakami, M. Horbatsch, and H. J. Lüdde,
Ion collisions with water molecules: a timedependent density functional
theory approach, in:
Advances in Quantum Chemistry, Vol. 65:
Theory of Heavy Ion Collision Physics in Hadron Therapy, ed. by Dz. Belkic,
(Elsevier, Amsterdam 2013)

M. Murakami, T. Kirchner, M. Horbatsch, and H. J. Lüdde,
Quantummechanical calculation of multiple electron removal and fragmentation
cross sections in He^{+}H_{2}O collisions,
Phys. Rev. A 86, 022719 (2012)

M. Murakami, T. Kirchner, M. Horbatsch, and H. J. Lüdde,
Fragmentation of water molecules by proton impact: the role of multiple electron processes, Phys. Rev. A 85, 052713 (2012)

M. Murakami, T. Kirchner, M. Horbatsch, and H. J. Lüdde,
Single and multiple electron removal processes in protonwater vapor collisions,
Phys. Rev. A 85, 052704 (2012)
In the long run we hope to study even more complex systems, thereby
exploring the transition from correlated to collective dynamics.
Our central goals are to contribute to a microscopic understanding of
timeresolved quantum dynamics and to investigate applicability
and limitations of density functional theory by practical calculations.
Full list of my publications
Vita (last update: August 1, 2012)
To York's Physics and Astronomy department homepage