Invited by the Astro2 society, National University of Ireland, Maynooth to give a seminar on "21st century light sources" in December 2009.
Invited by the School of Physics to give one of the TCD School of Physics seminars on "Inside the Chemical Bond" in October 2008.
Invited by the organisers of RIXS08, Uppsala, Sweden to give a seminar on "Resonant x-ray emission spectroscopies of organic molecular semiconductors" in June 2008.
Invited by Dr. Jean-Paul Mosnier to give a seminar to the School of Physical Sciences, Dublin City University, Ireland in December 2006.
Invited by Dr. Denise Gabuzda to give a seminar to the Physics Department of University College Cork, Ireland in April 2006.
Invited by Prof. Ronan McGrath to give a seminar to the Surface Science Research Center of the University of Liverpool, United Kingdom in March 2006.
Invited by Prof. Tom Morgan to give a colloquium seminar to the Physics Department at Wesleyan University, Midleton, Connecticut, USA in December 2002.
Invited by Prof. Dave Heskett to give a seminar to the Sensor and Surface Technology Partnership, Physics Department, University of Rhode Island, Kingston, Rhode Island, USA in April 2002.
Invited by Prof. Colm Whelan to give a talk at a conference entitled ''New Directions in Atomic Physics'', held in Cambridge, UK in July 1998.
"Soft x-ray emission studies at the Mn L-edge of LaMnO3 and CaMnO3", C. McGuinness, J. E. Downes, T. Learmonth, D. Fu, P.-A. Glans, K. E. Smith and P. D Johnson, presented at the March Meeting of the American Physical Society, Austin, March 2003.
"Band-gap evolution, hybridization and thermal stability of InxGa1-xN alloys measured by soft x-ray emission and soft x-ray absorption", C. McGuinness, P. Ryan, J. E. Downes, K. E. Smith, D. Doppalapudi and T. D. Moustakas, presented at the Materials Research Society Symposium, Boston, Dec 2002.
"Measurement of the B 2p valence band electronic structure of MgB2 using high-resolution soft x-ray emission spectroscopy", presented at a special session of the March Meeting of the American Physical Society, Seattle 2001.
"Electronic structure of Ba1-xKxBiO3 studied with high resolution soft x-ray absorption and soft x-ray emission spectroscopies", C. McGuinness, J. E. Downes, P. Ryan, K. E. Smith, G. Popov and M. Greenblatt, presented at the March Meeting of the American Physical Society, Seattle, 2001.
"RIXS studies of the electronic structure of CrO2 and Cr2O3 at the O K and Cr L2,3-edges", C. McGuinness, J. E. Downes, P. Ryan, K. E. Smith, C. B. Stagarescu, D. E. Eastman and A. Gupta, presented at the March Meeting of the American Physical Society, Seattle 2001.