Research

Research Projects and Publications

Molecular Dynamics Simulations of Crystalline and Amorphous Materials

Silica Fracture Movie (avi)

In collaboration with Carlos Pizarro, Universidad Catolica del Peru, and Dr. Joseph Simmons, University of Arizona

Publications/Presentations:

	"Visualization of fracture precursors in vitreous silica: study of under- and over-coordinated ions." F. Jones, R. Ochoa, and D. Knox, APS Spring Meeting, Pittsburgh, PA (March, 2009) (talk by F. Jones)
	"Computer Simulation Studies of Fracture in Vitreous Silica," R. Ochoa, M. Arief, and J. H. Simmons, Mat. Res. Soc. Symp. Proc. Vol. 731, 103-108 (2002).

Undergraduates Involved:

	Teri-Lynn Allonardo (Class of '04)
	Michael Arief (Class of '02)
	Andrew Bazergui (Class of '05)
	John Fischer (Class of '07)
	Frank Jones (Class 0f '09)
	Yawar "Spaz" Qadri (Class of '03)
	Michael Richman (Class of '07)
	Jeffrey Thomas (Class of '00)
	Michael Vergara (Class of '00)

Development of Experiments for Physics Education

Co-investigator: Carlos Pizarro, Universidad Catolica del Peru

Publications/Presentations

	"Introductory physics experiments using the Wiimote," W. Somers, F. Rooney, and R. Ochoa, APS Spring Meeting, Pittsburgh, PA (March, 2009) (talk by W. Somers and F. Rooney)
	"Analysis of the Resonance Frequencies of a Cantilever Beam," M. Hvasta and R. Ochoa, APT Meeting, Baltimore, MD (January 2008) (poster presentation)
	"An analysis of the linearity of half periods of Lorentz's pendulum," T. Wickramansinghe and R. Ochoa, Am. J. of Phys., 73, 442-45 (2005).
	"A constant velocity apparatus based on Lenz's law," T. Angle and R. Ochoa, Phys. Ed., 36, 488-490 (2001).
	"Quantitative Demonstration of Lenz's Law," R. Ochoa, F. Kolp, and J. Handler, Phys. Teach., 36, 50 (1998).
	"The computer mouse as a data acquisition interface: Application to harmonic oscillators," R. Ochoa and N. Kolp, Am. J. Phys., 65, 1116 (1997)
	"A mouse in our Lab," J. Handler, R. Ochoa, and N. Kolp, Phys. Teach., 34, 488 (1996).

Undergraduates involved:

	Teri-Lynn Allonardo (Class of '04)
	Tiffany Angle (Class of '01)
	Charles Banyard (Class of '96)
	Jeff Chin (Class of '03)
	Kim Cox (Class of '05)
	Sean Elmes (Class of '05)
	Joel Handler (Class of '96)
	Thomas Holdbrook (Class of '03)
	Michael Hvasta (Class of '08)
	Zohaib Iqbal (Class of '12)
	Alex Lopez (Class of '10)
	Minal Patel (Class of '02)
	Michelle Reno (Class of '00)
	Frank Rooney (Class of '10)
	J.C. Sanders (Class of '02)
	Richard Santillo (Class of '04)
	Rob Sobczack (Class of '12)
	Julian Starr (Class of '12)
	Will Somers (Class of '09)
	Kyle Van Gilson (Class of '02)
	Jill Vorhees (Class of '01)
	Sarah Wanger (Class of '07)

Raman and Photoluminescence Studies of CdTe and CdS nanocrystals

Supported by a grant from Research Corporation and TSC funds (6/1/94-5/31/96)

Publications:

	Quantum confinement effects on the photoluminescence spectra of CdTe nanocrystallites," O. Romulo Ochoa, C. Colajacomo, E. J. Witkowski III, J.H. Simmons, and B.G. Potter, Jr., Sol. State Comm. 98, 717 (1996).
	Raman characterization of CdTe nanocrystallites embedded in a glass matrix," O. Romulo Ochoa, E.J. Witkowski, C. Colajacomo, J.H. Simmons, and B.G. Potter, Jr., Mat. Sci. Let. 16,613 (1997).

Undergraduates Involved:

	Claudio Colajacomo(Class of '95)
	Jeff Hendrickson (Class of '96)
	Rob Klueg (Class of '97)
	Steve Morrow (Class of '96)
	Scott Sorraiocco (Class of '98)
	Ed Witkowski (Class of '95)

Raman microprobe studies of CdTe quantum dots

Supported by a grant from the Petroleum Institute Fund (American Chemical Society) and TCNJ funds (8/1/95 - 8/31/97)

Undergraduates Involved:

Maggie Benoit (Class of '99)

Rafael Calderon (Class of '97)

Jeff Hendrickson (Class of '96)

Rob Klueg (Class of '97)

Scott Sorraiocco (Class of '98)

Selected Publications:

	An analysis of the linearity of half periods of Lorentz's pendulum," T. Wichramansinghe and R. Ochoa, Am. J. of Phys., 73, 442-45 (2005).
	General Physics Laboratory Manual," R. Ochoa, F. Kolp, D. Dalafave, R. Gleeson, and R. J. Pfeiffer, 4th Ed., J. Wiley Custom Services,NY, (2004).
	Computer Simulation Studies of Fracture in Vitreous Silica," R. Ochoa, M. Arief, and J. H. Simmons, Mat. Res. Soc. Symp. Proc. Vol. 731, 103-108 (2002).
	A constant velocity apparatus based on Lenz's law," T. Angle and R. Ochoa, Phys. Ed., 36, 488-490 (2001).
	General Physics Laboratory Manual," R. Ochoa, S.K. Dalafave, F. Kolp, and R. Gleeson, J. Wiley Custom Services,NY, 1st Ed. (1997), 2nd Ed. (1999), 3rd Ed. (2001).
	Absorption and Raman Spectroscopies from Semiconductor-glass Composites," T. J. Bukowski, T. M. Neidt, R. Ochoa, and J. H. Simmons, Journal of Non-Crystalline Solids 274, 87-92 (2000).
	Quantitative Demonstration of Lenz's Law," R. Ochoa, F. Kolp, and J. Handler, Phys. Teach., 36, 50-51 (1998).
	The computer mouse as a data acquisition interface: Application to harmonic oscillators," R. Ochoa and N. Kolp, Am. J. Phys., 65, 1115-18 (1997).
	Raman characterization of CdTe nanocrystallites embedded in a glass matrix," O. Romulo Ochoa, E.J. Witkowski, C. Colajacomo, J.H. Simmons, and B.G. Potter, Jr., Mat. Sci. Let.16,613-16 (1997).
	A mouse in our Lab," J. Handler, R. Ochoa, and N. Kolp, Phys. Teach., 34, 488-90 (1996).
	Quantum confinement effects on the photoluminescence spectra of CdTe nanocrystallites," O. Romulo Ochoa, C. Colajacomo, E. J. Witkowski III, J.H. Simmons, and B.G. Potter, Jr., Sol. State Comm. 98, 717-21 (1996).
	Non-linear Optical Processes in Quantum-Confined, Cluster-Insulator Composites," J.H. Simmons, B.G. Potter and R. Ochoa, Handbook of Laser Science and Technology, Supplement 2-Optical Materials, CRC Press, Boca Raton FL, (1995).
	Increased Precision in Strain Measurement of Diamond by MicroRaman Spectroscopy," W.B. Alexander, P.H. Holloway, J, Simmons, and R. Ochoa, J. Vac. Sci. Technol. A 12, 2943-45 (1994).
	Visible Light Emission from Heavily Doped Porous Silicon Homojunction pn Diodes," Z. Chen, G. Bosman, and R. Ochoa, Appl. Phys. Lett. 62, 708-10 (1993).
	Atomistic Modeling and Simulation of the Structure and Transport Properties of Glass," J.H. Simmons, R. Ochoa and T. Neidt, in Experimental Techniques of Glass Science, C.J. Simmons and O.H. El-Bayoumi, Eds.; Amer. Ceram. Soc., Columbus, Ohio (1993).