Hyperfine structure measurements of neutral atomic iodine (127I) in the infrared region (1800-6000 cm−1)

Ashok, Chilukoti; Vishwakarma, S. R.; Bhatt, Himal; Deo, M. N.

doi:10.1016/j.jqsrt.2019.06.029

Cited by 2 publications

(1 citation statement)

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“…Doppler-free spectroscopy reveals the hyperfine structure of the 2 P 3/2 → ( 3 P 2 )6p 2 [1] o 3/2 and 2 P 3/2 → ( 3 P 2 )6p 2 [3] o 7/2 lines, which is found to agree perfectly with the structure that has been well-known after repeated hyperfine investigations (Jaccarino et al 1954, Luc-Koenig et al 1973, 1975, Mu et al 2018, Ashok et al 2019. However, fitting the expected multiplet to the observed structure reveals a global shift of both lines by −0.169 cm −1 with respect to the energies of the atomic spectra database of the National Institute of Standards and Technology (NIST) (Kramida et al 2021).…”

Section: Absolute Energy Of the Excited Statessupporting

confidence: 73%

Two-photon absorption laser induced fluorescence (TALIF) detection of atomic iodine in low-temperature plasmas and a revision of the energy levels of I I

Esteves¹,

Blondel²,

Chabert³

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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In order to perfect the use of iodine, instead of xenon, in plasma thrusters, an experiment has been set up to investigate the feasibility of two-photon absorption laser induced ﬂuorescence (TALIF) diagnostics in iodine plasmas. Levels (3P2)6p 2[1]o3⁄2 and (3P2)6p 2[3]o7⁄2 of atomic iodine were found qualiﬁed for that purpose, with a radiative lifetime of the former found equal to 35.5(9) ns, which appears consistent with the 32.5(1.2) ns predicted by the most recent calculations. Doppler-free two-photon spectroscopy has confirmed that the relative intensities of the hyperfine components follow well-known general formulas, which makes it possible to disentangle the hyperfine structure of 127I from Doppler broadening. Accurate temperature measurements are shown to be possible, even though the relatively heavy mass of the iodine atom does not make it the most favorable gauge for measurements based on Doppler e ect. Using an injection seeded pulsed laser as the primary laser source, the frequency-tripling of which has provided the ca 300 nm radiation used for excitation, absolute energy measurements of the two-photon excited levels revealed that all upper energy levels of I I have to be revised down, by -0.169(11)cm-1, which pulls every energy level off its presently tabulated value by more than thirty times the currently admitted uncertainty bar.

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