Hyperfine structure analysis in the intense spectral lines of the neutral Cu atom falling in the 353-809 nm wavelength region using a Fourier transform spectrometer

- An improved list of 'A' and 'B' hyperfine structure constants for Cu-63 is presented.
- The sign of the 'A' hfs constant of 44,963 cm−1 3d94s4p was changed from +1920 to −1920 MHz.
- 'A' and 'B' hfs constants for the six energy levels are reported for the first time.
- Over 17 spectral lines have been measured in the 353-809 nm wavelength region.

Hyperfine structure analyses have been performed in the high-resolution spectrum of the neutral copper atom covering the wavelength region of 353-809 nm using Fourier transform spectroscopy. A DC discharge of natural copper produced in a liquid nitrogen cooled hollow cathode lamp used as a light source and a photomultiplier tube as well as Si photodiodes were employed as the light detectors. The hfs studies in 17 transitions of the neutral copper atom originating from 17 energy levels for 63Cu have been reported here. The present investigation has provided the magnetic dipole coupling constant A and electric quadrupole coupling constant B for the first time for the following 6 even-parity levels lying at 49,935, 49,942 cm−1, of 3d104d configuration, 52,848 cm−1 of 3d106 s configuration, 55,387, 55,391 cm−1 3d105d configuration and 71,978 cm−1 of 3d104s4d configuration. The sign convention of the previously-reported hfs A value amounting to 1920 MHz for the level at 44,963 cm−1 of 3d94s4p configuration has been revised to −1920 MHz. Measurements reported earlier of A and B hfs constants for the 11 odd-parity energy levels also have been confirmed.