state selection of ammonia molecular beam using tapered ring focuser. Baghdad Science Journal, Iraq, Baghdad, v. 2, n. 2, p. 245–252, 2005. DOI: 10.21123/bsj.2005.608. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/608.. Acesso em: 20 dec. 2024.