Resonance-enhanced multiphoton ionization spectroscopy of laser-ablated copper atoms

- nd Rydberg series of Cu using (2 + 1) REMPI spectroscopy.
- 3d104p1 (2P3/2,1/2) ← 3d104s1 (2S1/2) transitions seen using (1 + 1′) REMPI.
- Metastable Cu atoms observed using REMPI, survive many 100s of μs.