October 2009 Meeting
The three hundred and eighty fifth meeting of the American Chemical Society Susquehanna Valley Section will be held on Wednesday, 21 October 2009 at Wilkes University. The dinner will be followed by brief section announcements and a guest presentation entitled 3D Chemical Imaging using Mass Spectrometry and Lasers by David Willingham of Department of Chemistry at The Pennsylvania State University.Directions and parking: see below
Dinner: from 6:00 - 7:15 p.m. in the Hiscox Room (on the 2nd floor) of the Henry Student Center. Dinner will be buffet style and will include Chicken Piccata or Penne Pasta with Fresh Tomatoes, Fresh Spinach and Feta cheese. Sides will include red roasted potatoes, fresh green beans and fancy cut carrots . The meal will also include dinner rolls, a house salad, and the dessert (Chef's choice). Cost of the dinner is $14.00 Please RSVP by Friday, 16 October 2009 to Ms. Mary Lou Gillespie at 570.408.4750 o r by email (mary.gillespie@wilkes.edu).
Meeting Announcements / Presentation: 7:30 p.m. in Stark Learning Center Room 380.
3D Chemical Imaging using Mass Spectrometry and Lasers
Molecular time-of-flight secondary ion mass spectrometry (ToF-SIMS) imaging and cluster ion beam erosion are combined to perform a three-dimensional chemical analysis of a patterned physical vapor deposited (PVD) thin film of guanine. This model system allows for the in depth interrogation of the ultimate lateral resolution, depth resolution and overall useful ion yields that can be obtained from this type of three-dimensional chemical analysis. Although successful for model systems where analyte concentrations are high, ToF-SIMS three-dimensional imaging suffers from low ionization probabilities for most biologically relevant molecules limiting its applicability to real life biological systems. The use of strong-field lasers to increase the ionization probabilities of biologically relevant molecules is explored in great detail. While the end goal of obtaining a three-dimensional chemical analysis of a single biological cell has not been realized, the data presented here has taken remarkable strides toward improving the overall quality of ToF-SIMS three-dimensional chemical analyses.
David Willingham earned his B. S. degree in Chemistry from Wilkes University summa cum laude. His Ph.D. research was performed at The Pennsylvania State University with Professor Nicholas Winograd. His areas of expertise include ToF-SIMS and high power femtosecond lasers. He is an author on nine peer reviewed publications and has presented his work at several national and international scientific meetings; most recently at the 17th International Conference on Secondary Ion Mass Spectrometry in Toronto, Canada. David Willingham has also received a number of student honors while in graduate school including the ASSD Student Award, AVS Dorothy M. and Earl S. Hoffman Travel Grant, 21st Annual Workshop on SIMS Student Award and the SIMS XVI Student Award. David Willingham has accepted a Postdoctoral Fellowship at the Indian Head Division of the Naval Surface Warfare Center in Indian Head, MD and plans to start his research there following the conferring of his Ph.D. degree in December of this year.
Directions and parking:
Directions: Take I-81 to Route 309 North (Exit 170B, Old Exit 47B). Follow Route 309 North to Exit 3 (Plains/River Street) and make a left onto River Street at the traffic light at the bottom of the exit ramp. Follow River Street south to Wilkes University (located on the left side of River St). The Henry Student Center (HSC) is located at 84 W. South Street and the Stark Learning Center is on River St. mid-block between Northampton and South Streets.
Parking: To arrive at the Henry Student Center (HSC) turn left onto South Street at the 9th traffic light after the ramp. The HSC will be on the right. There is a parking accessible by an entrance immediately past the Henry Student Union Building (SUB) on South St. You may also park in most other campus lots.
Detailed directions and maps can be found at: http://www.wilkes.edu/pages/273.asp.
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