Explanation of lifetime measurement techniques at an electron beam ion trap

Atomic lifetime measurements
at the Livermore electron beam ion traps

Isolectronic sequence	Ion	Level	Lifetime	Observation	Reference
He I	N5+	1s2s 3S1	3.93±0.05 ms	x-ray	5
	O6+		956±5 µs	x-ray	2
	F7+		276±2 µs	x-ray	5
	Ne8+		91.7±0.4 µs	x-ray	3
	Mg10+		13.61±0.49 µs	x-ray	1
	S14+		703±4 ns	x-ray	13
Be I	Ar14+	2s2p 3Po2	15.0±0.8 ms	vis	6
	K15+		7.65±0.50 ms	vis	7
B I	Cl12+	2s22p 2Po3/2	21.0±0.5 ms	vis	9
	Ar13+		9.30±0.12 ms	vis	6
	K14+		4.43±0.10 ms	vis	7
F I	Ar9+	2s22p5 2Po1/2	9.70±0.15 ms	vis	6
	K10+		4.46±0.10 ms	vis	7
Ne I	Fe16+	2s22p53s 3Po2	4.91+0.23-0.08 µs	X ray	14
Al I	Fe13+	3s23p 2Po3/2	16.74±0.12 ms	vis	10
Si I	Kr22+	3s23p2 3P2	6.82±0.10 ms	uv	4
P I	Kr21+	3s23p3 2Do5/2	0.80±0.03 ms	uv	8
Ar I	Kr18+	3s23p53d 3Po2	2.3±0.1 ms	vis	8
	Kr18+	3s23p53d 3Fo2	4.2±0.5 ms	vis	8
K I	Kr17+	3s23p63d 2D5/2	22.7±1.0 ms	vis	8
Ca I	Kr16+	3s23p63d2 3P2	approx. 4.2 ms	vis	8
Ni I	Xe26+ (nat. isotope mix)	3d94s 3D3	11.5±0.5 ms	XUV	11
	132Xe26+	3d94s 3D3	15.06±0.24 ms	XUV	12
	129Xe26+	3d94s 3D3(F=7/2)	15.1±0.5 ms	XUV	12
	129Xe26+	3d94s 3D3(F=5/2)	2.7±0.1 ms	XUV	12
	Cs27+	3d94s 3D3	8.2±2 ms	XUV	11
	Ba28+	3d94s 3D3	4.3±3.6 ms	XUV	11

Atomic lifetime measurements
at other electron beam ion traps

Isolectronic sequence	Ion	Level	Lifetime	Observation	Laboratory
Be I	Ar14+	2s2p 3Po2	15.0±0.7 ms	vis	Oxford EBIT (1998)
B I	Ar13+	2s22p 2Po3/2	8.7±0.5 ms	vis	NIST EBIT (1998)
			9.597±0.021 ms	vis	Heidelberg EBIT (2004)
			9.573(4)(5) ms	vis	Heidelberg EBIT (2005)
Al I	Fe13+	3s23p 2Po3/2	16.726+0.020-0.010 ms	vis	Heidelberg EBIT (2006)
Si I	Kr22+	3s23p2 3P2	5.7±0.5 ms	uv	NIST EBIT (1998)
Cl I	Fe9+	3s23p5 2P1/2	14.2±0.2 ms	vis	Heidelberg EBIT (2009)
Ti I	Xe32+	3d43p3 5D3	2.15±0.14 ms	uv	NIST EBIT (1997)

References
1) G. S. Stefanelli, P. Beiersdorfer, V. Decaux, K. Widmann, Phys. Rev. A 52, 3651 (1995)
2) J. R. Crespo López-Urrutia, P. Beiersdorfer, D. W. Savin, K. Widmann, Phys. Rev. A 57, 238 (1998)
3) E. Träbert, P. Beiersdorfer, G. V. Brown, A. J. Smith, S. B. Utter, M. F. Gu, D. W. Savin, Phys. Rev. A 60, 2034 (1999)
4) E. Träbert, S. B. Utter, P. Beiersdorfer, Phys. Lett. A 272, 86 (2000)
5) P. A. Neill, E. Träbert, P. Beiersdorfer, G. V. Brown, C. L. Harris, A. J. Smith, S. B. Utter, K. L. Wong, Physica Scripta 62, 141 (2000)
6) E. Träbert, P. Beiersdorfer, S. B. Utter, G. V. Brown, H. Chen, C. L. Harris, P. A. Neill, D. W. Savin, A. J. Smith, Astrophys. J. 541 (1), 506 (2000)
7) E. Träbert, P. Beiersdorfer, G. V. Brown, H. Chen, C. L. Harris, E. H. Pinnington, D. B. Thorn, Phys. Rev. A 64, 034501 (2001)
8) E. Träbert, P. Beiersdorfer, G. V. Brown, H. Chen, D. B. Thorn, E. Biémont, Phys. Rev. A 64, 042511 (2001)
9) E. Träbert, P. Beiersdorfer, G. Gwinner, E. H. Pinnington, A. Wolf, Phys. Rev. A 66, 052507 (2002)
10) P. Beiersdorfer, E. Träbert, E. H. Pinnington, Astrophys. J. 587, 836 (2003)
11) E. Träbert, P. Beiersdorfer, G. V. Brown, K. R. Boyce, R. L. Kelley, C. A. Kilbourne, F. S. Porter, A. Szymkowiak, Phys. Rev. A 73, 022508 (2006)
12) E. Träbert, P. Beiersdorfer, G. V. Brown, Phys. Rev. Lett. 98, 263001 (2007)
13) J. R. Crespo López-Urrutia, P. Beiersdorfer, K. Widmann, Phys. Rev. A 74, 012507 (2006)

Three recent reviews cover more measurements of such long atomic level lifetimes, using a variety of ion trap types, and give references to the physics context.
Physica Scripta 61, 257 (2000)
Physica Scripta T 100, 88 (2002)
Can. J. Phys. 80, 1481 (2002)
Talk at 20 Years of Spectroscopy at EBIT meeting, Berkeley (11/2007)
Talk at Mullard Space Science Laboratory and at Cambridge University (12/2007)

This way to the

University of California Lawrence Livermore National Laboratory Electron Beam Ion Trap
(new directorate, web site lagging, temporarily hosted at Space Sciences Laboratory, UC Berkeley)

Livermore EBIT lifetime papers

Lifetime measurements at the Heidelberg heavy-ion storage ring TSR

E. Träbert Home page

Page updated on 27 Jan 2010