Simultaneous observation of Lyman-. cap alpha. and Balmer-. beta. transitions in hydrogenic iron, Fe/sup 25+/: A novel technique for 1s Lamb-shift measurement

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.36.1515· OSTI ID:6011702

Silver, J D; McClelland, A F; Laming, J M; Rosner, S D; Chandler, G C; Dietrich, D D; Egan, P O

The n = 2 to n = 4 Balmer-..beta.. transitions in hydrogenic Fe/sup 25+/ have been observed in the first order of Bragg diffraction in a beam-foil light source. Simultaneous observation of the 1s-2p Lyman-..cap alpha.. transitions from the same source in the fourth diffraction order leads to a new method for the measurement of the 1s ground-state Lamb shift which is less sensitive to uncertainties arising from Doppler shifts than previous work. With the use of the Balmer-..beta.. transitions for calibration, the Lyman-..cap alpha.. wavelengths are for the 1s /sup 2/S/sub 1/2/--2p /sup 2/P/sub 3/2/ transition, 1.77815 +- 0.00019 A, and for the 1s /sup 2/S/sub 1/2/--2p /sup 2/P/sub 1/2/ transition, 1.78364 +- 0.00019 A. Values of the Lamb-shift contributions to the 1s-2p transitions, and the 2p/sub 1/2,3/2/ fine structure, are extracted.

• Research Organization: University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1chemically bond3PU, Engl. C. Chandler, D. D. Dietrich and P. O. Egan
• OSTI ID: 6011702
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 36:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC IONS
BALMER LINES
CARBON
CHARGED PARTICLES
COINCIDENCE METHODS
COUNTING TECHNIQUES
ELEMENTS
EMISSION
FOILS
ION SPECTROSCOPY
IONS
IRON IONS
LAMB SHIFT
LYMAN LINES
NONMETALS
PHOTOEMISSION
SECONDARY EMISSION
SPECTRAL SHIFT
SPECTROSCOPY