Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 39, Issue 5, Pages L77-L82Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/39/5/L01
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The emission spectrum of neodymium produced by vacuum spark sources was observed in the vacuum ultraviolet on two normal-incidence spectrographs. In an initial result, more than 550 lines have been identified as transitions from 85 4f(2) 5d levels to 37 levels of the 4f(3) ground configuration in the free ion Nd3+. The levels 4f(3 4)F(3/2) and I-4(11/2), responsible for the well-known 1064 nm laser line, have respective positions of 11698.57 +/- 0.1 cm(-1) and 1897.07 +/- 0.1 cm(-1) above the ground level I-4(9/2). The newly found levels of 4f(3) constitute the first isolated 4f(N) configuration (N > 2) and therefore enable checks of effective parameters that represent far configuration interaction. Slater parameters F-k(4f, 4f) derived from Nd3+:LaCl3 are 3% to 5% smaller than in the free ion.
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