Number of items: 3.
Kiernan, Laurence and Kennedy, Eugene T. and Mosnier, Jean-Paul and Costello, John T. and Sonntag, B. (1994) First observation of a photon-induced triply excited state in atomic lithium. Physical Review Letters, 72 (15). pp. 2359-2362. ISSN 0031-9007
Costello, John T. and Kennedy, Eugene T. and Sonntag, B. and Clark, C. (1991) 3p photoabsorption of free and bound Cr, Cr⁺, Mn, and Mn⁺. Physical Review A, 43 (3). pp. 1441-1450. ISSN 1050-2947
Cooper, J. and Clark, C. and Cromer, C. and Lucatorto, T. and Sonntag, B. and Kennedy, Eugene T. and Costello, John T. (1989) Marked differences in the 3p photoabsorption between the Cr and Mn⁺ isoelectronic pair: reasons for the unique structure observed in Cr. Physical Review A, 39 (11). pp. 6074-6077. ISSN 0556-2791