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⁷H has not been observed. Attempts have been made to detect it in the spontaneous fission of ²⁵²Cf (1982AL33) and in the ⁷Li(π^-, π⁺) reaction [see (1984AJ01)]. A study of ⁹Be(π^-, 2p) (1987GO25) found no evidence for ⁷H. See also the review of (1989OG1B) and the ⁷Li(π^-, π⁺) investigation reported in (1989GR06). The ground state is calculated to have J^π = 1/2⁺ and to be unstable with respect to 1n, 2n, 3n and 4n emission. Excited states are predicted at 4.84, 5.00 and 6.96 MeV, with J^π = 3/2⁺, 5/2⁺, and 5/2^- [(0 + 1)ℏω model space] and at 3.88, 3.94 and 5.99 MeV with J^π = 3/2⁺, 5/2⁺ and 1/2⁺ [(0 + 2)ℏω model space] (1985PO10). See also references cited in (1988AJ01).