TY - JOUR AU - Penn, David AU - Apell, S C2 - Revista Colombiana de Fisica DA - 1991-01-01 00:01:00 LA - en M1 - 24 PB - Revista Colombiana de Fisica PY - 1991 TI - Spin Polarized Metastable Atom He De-excitation, Theory UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620377 ER -