The FERRUM project: Experimental transition probabilities from highly excited even 5s levels in Cr ii

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Volume 570 (October 2014)

A&A, 570 (2014) A34

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Table 1

Experimental details and the measured lifetimes of the 5s ⁶D levels in Cr ii.

Upper level^a	J	Lower level^a	J	Excitation^b	Detection^c	τ_exp/ns	τ_th/ns
5s ⁶D_J		4s ⁶D_J
E/cm^-1		E/cm^-1		λ_air/nm	λ_air/nm


82 692	1/2	11 962	1/2	282.680	279	2.5 ± 0.2	2.95^d, 2.83^e
82 763	3/2^f	12 032	3/2				2.95^d, 2.85^e


82 881	5/2	12 148	5/2	282.669	280	2.5 ± 0.2	2.94^d, 2.84^e
					290


83 041	7/2	12 303	7/2	282.653	281	2.6 ± 0.2	2.94^d, 2.84^e
					290


83 240	9/2	12 496	9/2	282.629	282	2.6 ± 0.2	2.93^d, 2.86^e
					289
					299

Notes.

^(a)

Sansonetti et al. (2012);

^(b)

Two-photon excitation using this wavelength;

^(c)

Transitions at 280 nm connect to 4p z⁶F, those around 290 nm to 4p z⁶P and 299 nm to 4p z⁶D (see Fig. 2). All measurements were made in the second spectral order;

^(d)

Semiempirical superposition-of-configurations calculation by Kurucz (1995);

^(e)

Semiempirical calculation using orthogonal operators by Raasen & Uylings (1997);

^(f)

The J = 1/2 and 3/2 fine structure levels in e⁶D could neither be separated in the excitation nor in the detection channels.

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