In this Issue:
Local Section News
A note from Kris Patterson, the Acting Chairman of the Baltimore-Washington section of the Society for Applied Spectrroscopy.
Our meeting for May. This will be
held at NIST and will be featuring the SAS National Tour Speaker, Dr. Susan
Plunkett. In addition to the late afternoon talk, there will be a tour of the
new chemistry building at NIST and plan to follow that with an optional dinner
at a local restaurant.
It is our hope that by reducing the number of meetings, reducing the cost and by having meetings that end earlier we can meet the needs of the membership. This also reduces that amount of work required to be an officer in the local society. In order for this section of the Society to continue to exist, it is necessary to have people that can volunteer time to serve as officers. The amount of time required is not great and there are plenty of people who have served as officers in the past that can offer advice and will help. Please contact Mike Epstein or myself if you even think that you might be interested.
Kristine Patterson, Ph.D.
MAY 9 - National SAS Tour Speaker
Dr. Susan Plunkett
Philip Morris USA Research Center, Richmond, VA
Multi-component analysis of Cigarette Combustion Gases Using a High Resolution Mid-Infrared Tunable Diode Laser Spectrometer
A dual mid-infrared tunable diode laser system (IR-TDL) has been developed for the simultaneous detection of multiple gaseous components in cigarette smoke. The high spectral resolution (0.0006 cm-1) and rapid time response (20 Hz) of the TDL system are ideal for separating the absorptions from the multitude of gas phase components found in this matrix. The combustion products are sampled into either a 0.3 liter, 18 meter multiple pass absorption cell for time-resolved applications or into a 3.0 liter, 100 meter absorption cell for improved sensitivity. Two independent beam paths allow simultaneous detection in two wavelength regions; the first for ethylene and ammonia at ca. 965 cm-1 and the second for formaldehyde at ca. 2800 cm-1. A non-linear least squares procedure is used for on-line "fingerprint" fitting of up to four gases with each diode. We have observed as many as six gases (off-line) in a 0.3 cm-1 spectral range in the smoke matrix. Results demonstrating the instrument sensitivity and time response, and the complexity of the smoke matrix will be presented. New TDL applications, such as monitoring volatile reporter molecules in expired breath or in transdermal emissions as non-invasive bio-markers for early disease diagnosis will be discussed. Also new enabling technologies, such as quantum cascade lasers which operate near room temperature with a reliable spectral output as opposed to cryogenic semi-conductor-based lead-salt diode sources will be demonstrated.
Dr. Susan Plunkett received a B.S. in Chemistry and a B.A. in History
(magna cum laude) from the University of Richmond, Richmond, VA in 1989. She
performed graduate work at Duke University under the direction of Professor
Richard A. Palmer, developing and applying time-resolved step-scan FT-IR spectroscopy
to the study of the photodynamics of heme proteins and transition metal complexes.
Susan conducted postdoctoral research with Professor Mark Braiman in the Biochemistry
Department at University of Virginia, Charlottesville, VA. She used step-scan
FTIR to study the photodynamics of the transmembrane chlorine pump halorhodopsin
and developed supported planar germanium waveguides for obtaining mid-IR evanescent-wave
absorption spectra from biomembranes of individual cells. In 1996 she joined
Philip Morris, USA Research Center in Richmond, VA developing infrared spectroscopic
methods to analyze cigarette smoke, particularly high resolution mid-infrared
tunable diode laser absorption spectroscopy.
Date: Thursday May 9, 2002
Place: Room A202, Building 227 (Advanced Chemical Sciences Laboratory), National Institute of Standards and Technology, Gaithersburg, Md 20899
Time: Tour at 1:30 pm, talk at 3 pm.
Cost: None for the tour or talk. We will take the speaker to dinner after the talk and all are invited to join us at a local restaurant.
Reservations: Because of increased security at NIST (we are now a closed campus), ALL visitors must go through a security check at the main gate. I must have a list of all attendees by noon on Wednesday, May 8. If you plan to attend, you can contact me by email at firstname.lastname@example.org or by phone at 301-975-8941. I will need your name, affiliation, and contact information. I will also arrange a tour of facilities for those who wish to come early, before the talk. More details shortly.
Directions: From northbound I-270 take Exit 10, Route 117 West, Clopper Road. Make sure you are on the auxillary access road as you near Gaithersburg rather than on the main 270, since the exit is difficult to make directly off 270. Go around the curve and get into the left lane. At the first light on Clopper Road, turn left onto the NIST grounds. As you near the guard house, turn right into the visitor parking lot and register at visitor security. If you have contacted me, they will have your name on the access list. When you leave the visitor parking lot, you will see the ACSL (Advanced Chemical Sciences Laboratory, Building 227) in front of you. Turn left and go around the curve and you will see the parking lot in front of the ACSL on your right. When you enter the building, go through the double set of doors and turn left, and take the elevator to the second floor, exit and turn right. Room A202 is immediately on your right. We will meet there at 1:30 pm for the tour. If you are not attending the tour, the seminar will be at 3 pm. We will decide on dinner plans after the talk.
From southbound I-270 take Exit 11, Route 124, Montgomery Village Avenue/Quince
Orchard Road. Bear right at the first light onto Route 124 West, Quince Orchard
Road. At the third light on Quince Orchard Road, turn left onto Route 117, West
Diamond Avenue. Turn right at the first light onto NIST grounds and continue
Your Baltimore-Washington Section Officers for 2001-2002:
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Links to other local scientific organizations and conferences of interest:
Chemical Society of Washington, CSW, Local Section of the American Chemical Society
Conference on Mid-Infrared Optoelectronics Materials and Devices, September
8-11, 2002, Annapolis, Maryland
Past Issues of the Baltimore-Washington Section Newsletter (including Historical Events in Chemistry for those months)
April/May Historical Events in Chemistry and Spectroscopy by Leopold May, Department of Chemistry, Catholic University
Go to the National SAS Home Page