Abstract

The high-dispersion absorption spectrum of Cu I is reported for the 1570–2500 Å region. Observations include the electric dipole allowed transitions 3<i>d</i><sup>10</sup>4<i>s</i><sup>2</sup><i>S</i> -3<i>d</i><sup>10</sup><i>np</i><sup>2</sup><i>P</i>º (<i>n</i> = 5-57), 3<i>d</i><sup>9</sup>4<i>s</i><sup>2</sup><sup>2</sup><i>D</i> -3<i>d</i><sup>10</sup><i>np</i><sup>2</sup><i>P</i>º (<i>n</i> = 6-17) and 3<i>d</i><sup>9</sup>4<i>s</i><sup>2</sup><sup>2</sup><i>D</i> -3<i>d</i><sup>10</sup><i>n</i>ƒ<sup>2</sup><i>F</i>º (<i>n</i> = 5,8), the electric quadrupole allowed transitions 3<i>d</i><sup>10</sup>4<i>s</i><sup>2</sup><i>S</i> -3<i>d</i><sup>10</sup><i>nd</i><sup>2</sup><i>D</i> (<i>n</i> = 4-8), and the forbidden transitions 3<i>d</i><sup>10</sup>4<i>s</i><sup>2</sup><i>S</i> -3 <i>d</i><sup>10</sup><i>ns</i><sup>2</sup><i>S</i> (<i>n</i> = 20-41). A number of transitions from 3<i>d</i><sup>10</sup>4<i>s</i><sup>2</sup><i>S</i> and 3<i>d</i><sup>9</sup>4<i>s</i><sup>2</sup><sup>2</sup><i>D</i> to levels associated with excited terms previously designated <i>w, x, y</i>, and <i>z</i> are also reported. An improved ionization potential for Cu I is 62 317.44 ± 0.10 cm<sup>-1</sup>.

© 1980 Optical Society of America

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