Atomic cesium 6h states observed by time-resolved FTIR spectroscopy

Civiš, Svatopluk; Kubelík, Petr; Jelínek, Petr; Chernov, V. E.; Knyazev, Mikhail

doi:10.1088/0953-4075/44/22/225006

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…The energy of the 6 2 H states is given by subtracting the transition energy from the known energy of the 20 2 G state at 31 131.935 70(15) cm −1 [33]. The result is 28 356.3(2) cm −1 , which is in good agreement with the value by Civiš et al of 28 356.426(45) cm −1 [41].…”

Section: Resultssupporting

confidence: 87%

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Observation of thresholds and overlapping resonances below the 102P1/2and2P
Lindahl
¹
,
Rohlén
²
,
Hultgren
³

et al. 2013
Phys. Rev. A
5
0
5
0
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A collinear beam apparatus has been used to study photodetachment of Cs − . Partial cross sections were measured using state-selective detection based on a resonance ionization scheme. Several resonances were observed in the Cs(10 2 S), Cs(6 2 F ), Cs(6 2 G), and Cs(6 2 H ) final-state channels below the Cs(10 2 P 3/2 ) channel opening. A model was developed to account for the interference between overlapping resonances. This model is essentially a generalization of the Fano [U. Fano, Phys. Rev. 124, 1866(1961] and Shore [ B. W. Shore, Phys. Rev. 171, 43 (1968)] parametrizations for single resonances. Resonance parameters were extracted by fitting the model to the data sets. The openings of the Cs(10 2 S) and Cs(6 2 F ) channels, where the polarizabilities of the atomic states are large and positive, showed rapid onsets. In the case of the Cs(6 2 G) and Cs(6 2 H ) channels, on the other hand, the photodetachment cross sections increased slowly with energy. For the Cs(6 2 H ) channel this is the expected behavior, since it is the result of a large and negative polarizability of the 6 2 H state. In addition, the excitation of the Cs(6 2 H ) state with respect to the Cs ground state was found to be 28 356.3(2) cm −1 , in agreement with a previous experiment.

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Section: Resultssupporting

confidence: 87%

“…This experiment constitutes only the second independent observation of the 6 2 H state in Cs [34,41]. Thus, it is of interest to discuss the details of the second step in the detection scheme for the Cs(6 2 H ) channel.…”

Section: Resultsmentioning

confidence: 99%

Observation of thresholds and overlapping resonances below the 102P1/2and2P
Lindahl
¹
,
Rohlén
²
,
Hultgren
³

et al. 2013
Phys. Rev. A
5
0
5
0
View full text Add to dashboard Cite

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“…This means that even if the observed line intensities display some deviations from the proportionality to the S -values, they should describe the qualitative picture of the relative line intensities adequately enough to assign the lines. A typical example of a Boltzmann plot for the ablation plasma can be found in Civiš et al (2011a). The uncertainty in the excitation temperature is small enough to consider the Boltzmann population distribution to be a satisfactory approximation for our experiment.…”

Section: Methodsmentioning

confidence: 97%

Potassium spectra in the 700–7000 cm^-1domain: Transitions involving f-, g-, and h-states

Civiš

Ferus

Kubelík

et al. 2012

A&A

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Context. The infrared (IR) range is becoming increasingly important to astronomical studies of cool or dust-obscured objects, such as dwarfs, disks, or planets, and in the extended atmospheres of evolved stars. A general drawback of the IR spectral region is the much lower number of atomic lines available (relative to the visible and ultraviolet ranges). Aims. We attempt to obtain new laboratory spectra to help us identify spectral lines in the IR. This may result in the discovery of new excited atomic levels that are difficult to compute theoretically with high accuracy, hence can be determined solely from IR lines. Methods. The K vapor was formed through the ablation of the KI (potassium iodide) target by a high-repetition-rate (1.0 kHz) pulsed nanosecond ArF laser (λ = 193 nm, output energy of 15 mJ) in a vacuum (10 −2 Torr). The time-resolved emission spectrum of the neutral atomic potassium (K i) was recorded in the 700-7000 cm −1 region using the Fourier transform infrared spectroscopy technique with a resolution of 0.02 cm −1 . The f -values calculated in the quantum-defect theory approximation are presented for the transitions involving the reported K i levels. Results. Precision laboratory measurements are presented for 38 K i lines in the infrared (including 25 lines not measured previously in the laboratory) range using time-resolved Fourier transform infrared spectroscopy. The 6g, 6h, and 7h levels of K i are observed for the first time, in addition to updated energy values of the other 23 K i levels and the f -values for the transitions involving these levels. Conclusions. The recorded wave numbers are in good agreement with the data from the available solar spectrum atlases. Nevertheless, we correct their identification for three lines (1343.699, 1548.559, and 1556.986 cm −1 ).

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“…This work continues the series of FTIR spectroscopy studies of emission IR spectra of metal vapours formed in a laserablate plasma (Civiš et al 2010a, Civiš et al 2010b, 2011a, 2011c. We report the results of laboratory measurements for 31 Rb I lines in the 800-7700 cm −1 (1.4-14 μm) range.…”

Section: Discussionmentioning

confidence: 75%

Fourier transform infrared emission spectra of atomic rubidium: g- and h-states

Civiš¹,

Ferus²,

Kubelík³

et al. 2012

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

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Time-resolved Fourier transform infrared spectroscopy has been used to observe the rubidium atomic emission spectrum in a vacuum (10−2 Torr). We observe 31 Rb I lines in the 800–8000 cm−1 range with a resolution of 0.02 cm−1, including 21 previously unmeasured lines. From the measured spectra, we identify the energy values of the previously unknown 6g, 6h, 7g and 7h levels of Rb I. The oscillator strengths of the observed transitions are calculated using quantum defect theory.

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Atomic cesium 6h states observed by time-resolved FTIR spectroscopy

Cited by 7 publications

References 27 publications

Observation of thresholds and overlapping resonances below the 102P1/2and2P
Lindahl
¹
,
Rohlén
²
,
Hultgren
³

et al. 2013
Phys. Rev. A
5
0
5
0
View full text Add to dashboard Cite

Observation of thresholds and overlapping resonances below the 102P1/2and2P
Lindahl
¹
,
Rohlén
²
,
Hultgren
³

et al. 2013
Phys. Rev. A
5
0
5
0
View full text Add to dashboard Cite

Potassium spectra in the 700–7000 cm^-1domain: Transitions involving f-, g-, and h-states

Fourier transform infrared emission spectra of atomic rubidium: g- and h-states

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Atomic cesium 6h states observed by time-resolved FTIR spectroscopy

Cited by 7 publications

References 27 publications

Observation of thresholds and overlapping resonances below the 102P1/2and2PLindahl1, Rohlén2, Hultgren3 et al. 2013Phys. Rev. A5050View full textAdd to dashboardCite

Observation of thresholds and overlapping resonances below the 102P1/2and2PLindahl1, Rohlén2, Hultgren3 et al. 2013Phys. Rev. A5050View full textAdd to dashboardCite

Potassium spectra in the 700–7000 cm-1domain: Transitions involving f-, g-, and h-states

Fourier transform infrared emission spectra of atomic rubidium: g- and h-states

Contact Info

Product

Resources

About

Observation of thresholds and overlapping resonances below the 102P1/2and2P
Lindahl
¹
,
Rohlén
²
,
Hultgren
³

et al. 2013
Phys. Rev. A
5
0
5
0
View full text Add to dashboard Cite

Observation of thresholds and overlapping resonances below the 102P1/2and2P
Lindahl
¹
,
Rohlén
²
,
Hultgren
³

et al. 2013
Phys. Rev. A
5
0
5
0
View full text Add to dashboard Cite

Potassium spectra in the 700–7000 cm^-1domain: Transitions involving f-, g-, and h-states