The high-dispersion absorption spectrum of Cu i is reported for the 1570–2500 Å region. Observations include the electric dipole allowed transitions 3d104s2S –3 d10np2P° (n = 5–57), 3d94s2 2D –3 d10np2P° (n = 6–17) and 3d94s2 2D –3 d10nf2F° (n = 5,8), the electric quadrupole allowed transitions 3d104s2S –3 d10nd2D (n = 4–8), and the forbidden transitions 3d104s2S –3 d10ns2S (n = 20–41). A number of transitions from 3d104s2S and 3d94s2 2D to levels associated with excited terms previously designated w, x, y, and z are also reported. An improved ionization potential for Cu i is 62 317.44 ± 0.10 cm−1.
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