P. Stanley May, Professor of Physical Chemistry Laser Spectroscopy / Photo-Active Materials  Office: Churchill Haines 106; Phone: (605) 677-3141; Email: smay@usd.edu
B.S. 1982 College of Charleston PhD 1987, University of Virginia Postdoctoral Associate, 1988-1990 University of Bern, Switzerland  Postdoctoral Associate, 1990-1992 University of Virginia  XPS paragraph.docx project_summary_smay_mberry_markup.doc Laser Lab Glove Box Flamesealing Vycor

Research Interests: My research focuses on the synthesis and characterization of novel light-emitting materials.  I am involved in several larger research programs involving other scientists from USD and the region.  These are:

1. The Center for Research and Development of Light-Activated Materials (CRDLM)

2. The Northern Plains Undergraduate Research Center (NPURC)

3. Research Experiences for Undergraduates (REU) Program: “Photodynamics and Materials at the Nanoscale”

4. Photo-Activated Nanoscale Systems (PANS)

Relevent Publications (undergraduates are in bold-face type)

1. S. Sivakumar, F C. J. M van Veggel, and P. S. May, "Near-Infrared (NIR) to Red and Green Up-Conversion Emission from Silica  Sol-Gel Thin Films Made with La_0.45Yb_0.50Er_0.05F₃ Nanoparticles, Hetero-Looping-Enhanced Energy Transfer (Hetero-LEET): A New Up-Conversion Process, " J. Am. Chem. Soc., 2007, 129(3), 620.

2. F. P. Ow, M. T. Berry, P. S. May, and J. I. Zink  "Wavelength Dependent Photofragmentation Patters of Tris(2,2,6,6-tetramethyl-3,5-heptanedionato)Ln(III) (Ln=Eu, Tb, Gd) in a Molecular Beam,"  J. Phys. Chem. A.; (Letter), 2006, 110, 7751.

3. Y. An and P.S. May, “Temperature Dependence of Exited-State Relaxation Processes of Pr³⁺ in Pr-doped and Pr,Gd-Doped CsCdBr_3,”  J. Lumin., 2006, 118, 147.

4. Y. An,  A. Duhaime, and P.S. May, “Optical observation of the kinetics of thermalization between the ³P₀ and ³P₁ excited states of Pr³⁺ in symmetrical Pr³⁺-Gd³⁺ pairs in CsCdBr₃,” J. Lumin., 2005, 111, 131.

5. L. Tilkens, K. Randall, J. Sun, M.T. Berry and P.S. May, “Spectroscopic Evidence for Equilibrium between Eight- and Nine-Coordinate Eu³⁺(aq) Species in 0.1 M EuCl₃(aq),”  J. Phys. Chem. A, 2004, 108, 6624.

6. T.A. Lawrence, K.A. Murra and P.S. May, “Temperature Dependence of Rate Constants for Tb³⁺(⁵D₃) Cross Relaxation in Symmetric Tb³⁺ Pairs in Tb-Doped CsCdBr₃, CsMgBr₃, and CsMgCl₃,”  J. Phys. Chem. B, 2003, 107, 40002.

7. L.S. Xiao, M. Lang and P.S. May, “Optical Properties of Eu-Doped and Eu-Gd Co-Doped CsMgCl₃: Temperature Dependence of Rate Constants for ⁵D₂ and ⁵D₁ Cross Relaxation in Symmetric Eu(III)-Eu(III) Pairs,”  J. Phys. Chem. A, 2000, 104, 209.