Low-excited f-, g- and h-states in Au, Ag and Cu observed by Fourier-transform infrared spectroscopy in the 1000–7500 cm<sup>−1</sup>region

Civiš, Svatopluk; Matulková, Irena; Cihelka, J.; Kubelík, Petr; Kawaguchi, Kentarou; Chernov, V. E.

doi:10.1088/0953-4075/44/10/105002

Cited by 18 publications

(9 citation statements)

References 22 publications

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“…We note that previous hollowcathode studies of the K i spectrum did not report many of the IR lines that are listed in this work. In addition, our scheme was designed to perform measurements of the IR spectra of several targets, not solely potassium (see our previous results, Civiš et al 2010a;Civiš et al 2010bCiviš et al , 2011b.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

“…This infrared spectrum represents a great challenge for laboratory observations of new, unknown infrared atomic transitions involving atomic levels with a high orbital momentum (Civiš et al 2011b) and their comparison with the available stellar (e.g., solar) spectra. An attempt to fill this gap for K i is made in the present paper.…”

Section: Introductionmentioning

confidence: 99%

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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“…Table 3 compares our result with the Li I f -values available from NIST ASD (National Institute of Standards and Technology Atomic Spectra Database; Ralchenko et al 2011), which lists the data from the reviewing paper (Wiese & Fuhr 2009). As in our previous works (Civiš et al 2010a;Civiš et al 2010bCiviš et al , 2011bCiviš et al 2012a,b), the overall agreement of our QDT calculations with the results available in other sources is quite satisfactory and this agreement show the QDT calculations to be adequate for the identification of the observed transitions.…”

Section: Methodsmentioning

confidence: 68%

Li I spectra in the 4.65–8.33 micron range: high-Lstates and oscillator strengths

Civiš

Ferus

Kubelík

et al. 2012

A&A

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Context. Infrared (IR) astronomy capacities have rapidly developed in recent years thanks to several ground-and space-based facilities. To take advantage of these capabilities efficiently, a large amount of atomic data (such as line wavenumber, excited-level energy values, and oscillator strengths) are needed. These data are incomplete, in particular, for lithium whose abundances are important for several astrophysical problems. Aims. No laboratory-measured spectra of Li I have been reported for wavelengths longward of 6.6 microns. We aim to find new Li I lines in the 4.65-8.33 microns range due to transitions between states with high orbital momentum (l ≥ 4) and to determine the excitation energies of these states. Methods. The Li I lines were studied using the time-resolved Fourier transform infrared spectroscopy of a plasma created by the laser ablation of a LiF target in a vacuum. The classification of the lines was performed by accounting for oscillator strengths ( f -values) calculated using quantum defect theory (QDT). The adequacy of QDT for these calculations was checked by comparison with the available experimental and theoretical results. Results. We report four new Li I lines in the 900-2200 cm -1 range that allow us to extract the excitation energies of the 6g, 6h, and 7h states of Li I, which have not been measured before. We also provide a large list of QDT-calculated f -values for Li I in the range of 1-20 microns.

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“…[21,22], computational methods to investigate metal-cage vibrations and the structure of metallofullerenes are particularly valuable. DFT calculations are able to demonstrate that two isomers with different symmetry exhibit very different infrared spectra [23,24].…”

Section: Methods Of Calculationmentioning

confidence: 99%

The role of the encapsulated atom in the vibrational spectrа of La@C60–Lu@C60 lanthanide endofullerenes

Krisilov

Nechaev

Kotova

et al. 2015

Computational and Theoretical Chemistry

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Low-excited f-, g- and h-states in Au, Ag and Cu observed by Fourier-transform infrared spectroscopy in the 1000–7500 cm⁻¹region

Abstract: Abstract. The infrared emission spectra of Au, Ag and Cu resulting from the laser ablation of metal targets in a vacuum was recorded using time-resolved Fouriertransform spectroscopy in the 1200-1600, 1900-3600, 4100-5000 and 5200-7500 cm

Cited by 18 publications

References 22 publications

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

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

Li I spectra in the 4.65–8.33 micron range: high-Lstates and oscillator strengths

The role of the encapsulated atom in the vibrational spectrа of La@C60–Lu@C60 lanthanide endofullerenes

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Low-excited f-, g- and h-states in Au, Ag and Cu observed by Fourier-transform infrared spectroscopy in the 1000–7500 cm−1region

Abstract: Abstract. The infrared emission spectra of Au, Ag and Cu resulting from the laser ablation of metal targets in a vacuum was recorded using time-resolved Fouriertransform spectroscopy in the 1200-1600, 1900-3600, 4100-5000 and 5200-7500 cm

Cited by 18 publications

References 22 publications

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

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

Li I spectra in the 4.65–8.33 micron range: high-Lstates and oscillator strengths

The role of the encapsulated atom in the vibrational spectrа of La@C60–Lu@C60 lanthanide endofullerenes

Contact Info

Product

Resources

About

Low-excited f-, g- and h-states in Au, Ag and Cu observed by Fourier-transform infrared spectroscopy in the 1000–7500 cm⁻¹region

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

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