THE ELECTRONIC ALADDIN
NEWSLETTER NO. 32
CaPeRS Produces Exciting PEEM Results at SRC
SRC is now home to not one, but two Elmitec photoemission electron
microscopes (PEEM). Joining the longstanding PEEM program of Pupa
De Stasio and her collaborators, is CaPeRS - the Canadian Photoemission
Research Spectromicroscope, operated by Stephen Urquhart (U. Saskatchewan),
Adam Hitchcock (McMaster University) and their collaborators. Eventually
CaPeRS will be transferred to the Canadian Light Source (CLS) in
Saskatoon when the CLS beamlines are ready to receive it. In the
meanwhile it is being used at SRC for a wide range of scientific
projects, including assisting the development of improved biomaterials,
studying thin magnetic films, and spectral imaging of many samples,
from minerals to meteorites. In addition to specific scientific
goals, CaPeRS operation at SRC is developing an experienced PEEM
user community which will help scientific productivity at SRC, and
eventually, at CLS.
CaPeRS was delivered to SRC in April 2002 and gave excellent performance
‘right out of the box’. So far it has been used for over 20 weeks,
on 5 different beamlines (Hermon, 4mNIM, 10mTGM, CSRF-SGM, CSRF-DCM).
Most recently it was used on the Canadian double crystal monochromator
beam line, where imaging, spectroscopy, and spectromicroscopic analysis
was carried out at energies up to 4 keV. To the knowledge of the
investigators, this is the highest energy at which a PEEM has been
In the area of biomaterials, results from both Hermon and the Canadian
SGM were able to map fibrinogen, a blood protein, on a surface phase
segregated blend of polystyrene-polymethyl-methacrylate. This was
the first demonstration of its kind, despite several previous attempts
elsewhere. The ability to make measurements over an extended time
due to the low radiation damage rates with SRC fluxes, was a key
factor in this success. A poster describing those results is on
the north wall of the SRC vault.
In the near future, a preparation chamber will be added to CaPeRS
to allow in situ preparation of air sensitive surfaces. This will
facilitate planned programs in surface and thin film magnetism (Kazacheev
(CLS), Robertson (U. Nebraska)) and in amino acid surface chemistry
(Urquhart, Mitchell - U. Sask). The instrument is open to other
investigators for collaborative or independent work. Please contact
Stephen Urquhart (email@example.com) for details.
Click here to view some of the CaPeRS results.
2. January Infrared Workshop Enthusiastically Received
The first Midwestern workshop on applications and training in the
use of infrared spectromicroscopy was held January 13-17, 2003 at
the University of Wisconsin-Madison Synchrotron Radiation Center
(SRC). Twenty-one scientists from the United States and Canada attended
this week-long workshop which was intended for researchers of infrared
spectromicroscopy who use synchrotrons as their sources of infrared
light. The workshop was sponsored and hosted by the Synchrotron
Radiation Center (Stoughton, WI) and consisted of a series of lectures,
exercises, tutorials, and hands-on practical sample analysis. It
was co-taught by Professor Carol Hirschmugl (Department of Physics,
University of Wisconsin-Milwaukee) and Dr. Bob Julian (SRC staff
scientist) with additional help by Tim May (Canadian Light Source).
The first three days of the workshop consisted of lectures and
tutorials on infrared spectromicroscopy followed by two days of
hands-on experience at the storage ring. There was also a detailed
tour of the SRC facility. In order to accommodate users with all
levels of infrared experience, the three days of lecture made a
systematic progression from basic infrared spectroscopy all the
way through spectromicroscopy with the synchrotron.
The first day covered the basics of non-microscopic infrared spectroscopy.
During the second day, the concepts of the previous day were expanded
to cover the use of an infrared microscope for sample analysis.
The emphasis here was to focus the discussion on the use of standard
laboratory FTIR-Microscope combinations. The extension of infrared
spectromicroscopy to include applications using a storage ring as
an infrared source was presented on the third day. Practical applications
were a primary aspect of the workshop with the objective of answering
any questions that attendees might have regarding their own areas
of interest. During the first three days of the workshop participants
examined three application areas: the adhesion of printing inks;
the make up of algae; and multilayer polymer additive migration.
These three applications were examined each day in order to illustrate
the principles learned in the lectures and discussion. The first
day dealt with sample analysis using conventional infrared spectrometers,
while more detailed analyses were conducted on the second day using
bench top infrared microscopes. Finally, the minute details of each
sample, which could only be undertaken with the use of IRSR, were
examined on the third day. The overall goal of these exercises was
to get the participants to differentiate between which types of
analyses required synchrotron radiation and which did not.
During the last two days of the workshop participants were divided
into small groups and assigned time on the SRC infrared beamline
so that they could apply the new knowledge and skills they had acquired.
Most groups had their own samples to measure, ranging from algae
to potash. Each group practiced sample handling, data collection
setup, simple point measurements and, finally, a practical mapping
exercise. The participants expressed overwhelming enthusiasm for
the workshop in the evaluation forms they completed. An “A” rating
was almost universal. Participants commented that they felt that
all of the information presented was practical and informative.
They especially appreciated the variety of activities and the reinforcement
of lecture material with exercises and tutorials. Finally, some
very positive suggestions were presented which will be incorporated
in future workshops. The next workshop will be held in May.
3. Lowered Emittance Now Standard Operating Mode at SRC
Lowered emittance is now operational at the Aladdin storage ring at 800 MeV, with this accelerator set up running as the standard operating mode during select quanta. In particular, it has been found to offer significantly improved flux density for PEEM experiments. The regular emittance configuration, previously referred to as the "Aladdin beam," is now called the "base lattice." The base lattice remains the standard 1 GeV beam and is available upon request for the midnight shift. A lowered emittance 1 GeV tuning is under development. For more information on the low emittance beam, see the SRC newsletter #30, March 2002.
4. Congratulations to:
Keith Symon, former director of SRC, will be awarded the Particle
Accelerator Science and Technology Award in May 2003. This award
is given to individuals who have made outstanding contributions
to the development of particle accelerator science and technology.
Symon, who is an Emeritus Professor of Physics at the University
of Wisconsin-Madison, was awarded the prize for many fundamental
accelerator concepts which include invention of Fixed Field Alternating
Gradient Accelerators (FFAG), most notably incorporated into spiral
sector cyclotrons; for defining a formalism describing motion under
the influence of RF as required for stacking and other particle
manipulations; and for techniques for analyzing collective instabilities.
Gelsomina "pupa" de Stasio received one of five 2003 Romnes Awards.
The Romnes Award,named after the late H.I. Romnes, former chair
of the board of AT&T and former president of the WARF Board of Trustees,
is designed to help younger faculty further establish their scholarly
careers.The Wisconsin Alumni Research Foundation supports the $50,000
fellowships. The Graduate School Research Committee chooses the
recipients.The Romnes for the Physical Sciences was awarded to Prof.
Gelsomina "pupa" De Stasio, recognizing her as an exceptional faculty
member amongst the ones who have attained tenure within the past
Mike Bancroft has been named an officer of the Order of Canada
for his work with synchrotron radiation and the creation of Canada's
5. Upcoming Events
May 28-30, 2003 - The Infrared Spectromicroscopy Workshop with Environmental
Applications will be held at SRC. Information about the workshop
can be found at http://www.src.wisc.edu/ir_workshop/
September 14, 2003 - The SRC Open House
October 24-25, 2003 - SRC's 36th Users' Meeting. More information
will be available shortly at http://www.src.wisc.edu/meetings/SRC_UM2003/