Time-resolved Fourier transform infrared spectroscopy: Application to pulsed discharges

Kawaguchi, Kentarou; Hama, Yoichi; Nishida, Shigeki

doi:10.1016/j.jms.2005.02.007

Cited by 26 publications

(19 citation statements)

References 42 publications

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“…zero-cross point of the HeNe laser fringes. As a result, 1/n of each time-resolved interferogram is obtained after each scan Kawaguchi et al (2005). The timing diagram is shown in Fig.…”

Section: Methodsmentioning

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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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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“…zero-cross point of the HeNe laser fringes. As a result, 1/n of each time-resolved interferogram is obtained after each scan Kawaguchi et al (2005). The timing diagram is shown in Fig.…”

Section: Methodsmentioning

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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“…Several levels of the 4pπ 3 g and 5pπ 3 g states are strongly perturbed by close-lying 4f and 5f Rydberg states via the p -f interaction, as was pointed out previously. 22,27,29 Our MQDT calculations accurately reproduce these perturbations as can be seen in Table V. The calculated shifts induced by the p -f interaction are also included in Table V and can be as large as 2.2 cm −1 .…”

Section: Adjustment Of Eigenquantum-defect Parametersmentioning

confidence: 56%

“…By combining the data with spectroscopic data on low-lying triplet np and nf Rydberg states from the literature [22][23][24][25][26][27][28][29] a new set of energy-and R-dependent eigenquantum-defect parameters of multichannel quantum-defect theory was derived using a methodology established by Ch. Jungen and his coworkers.…”

Section: Discussionmentioning

confidence: 99%

“…In fit B, 230 triplet np and nf Rydberg states with positive electronic parity, v + ≤ 2, N + ≤ 9, N ≤ 8, and n in the range 2-39 were used. From the total of 491 energy levels, 15 triplet np levels were taken from Table IV above, 437 triplet np levels were taken from measurements carried out by Ginter and co-workers, [22][23][24][25][26] 19 triplet 4f levels were taken from Herzberg and Jungen, 27 and 20 triplet 5f levels were taken from Kawaguchi et al 29 All term values of triplet np Rydberg states taken from the literature are provided in the supplementary material 60 and the term values of the 4f and 5f Rydberg states 27,29 are listed in Table V together with data on 4pπ 3 g and 5pπ 3 g Rydberg states. 22 The data extracted from the RSR-TI spectra recorded in regions Q1-Q7 (Table III) were not used, because high-n Rydberg states with n > 86 are not sensitive to adjustments of eigenquantum defects.…”

Section: Adjustment Of Eigenquantum-defect Parametersmentioning

confidence: 99%

“…23,27 Using this model, a global description of the triplet np Rydberg states of He 2 was achieved in a fit of the relevant MQDT parameters to spectroscopic data available in the literature. [22][23][24][25][26][27][28][29] With this improved model, the positions of all known triplet np Rydberg states can be calculated within their experimental uncertainties, Born-Oppenheimer potential-energy curves of the 2-5p Rydberg states were derived, and the corresponding leading adiabatic corrections were estimated.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution spectroscopy and quantum-defect model for the gerade triplet np and nf Rydberg states of He2

Sprecher

Liu

Krähenmann

et al. 2014

The Journal of Chemical Physics

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Precision measurement of the rotational energy-level structure of the three-electron molecule He 2 + The data were combined with spectroscopic data on low-lying triplet np and nf Rydberg states from the literature to derive energy-and internuclear-distance-dependent eigenquantum-defect parameters of multichannel quantum-defect theory (MQDT). The MQDT calculations reproduce the experimental data within their experimental uncertainties and enabled the derivation of potential-energy curves for the lowest triplet p Rydberg states (n = 2-5) of He 2 . The eigenquantum-defect parameters describing the p -f interaction were found to be larger than 0.002 at the energies corresponding to the high-n Rydberg states, so that the p -f interaction plays an important role in the autoionization dynamics of np Rydberg states with

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High‐resolution Microwave and Infrared Spectroscopy of Molecular Cations

Amano

2011

Handbook of High‐resolution Spectroscopy

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High‐resolution spectroscopic results for molecular cations obtained in the wavelength regions from microwave to infrared are summarized, with emphasis on more recent developments made after the year 2000. Starting at some early stage development made with mostly discharge sources, various experimental techniques developed for the detection of ions are discussed in some details. Recent results on specific molecular ions such as H 3 + and H 3 O + and their isotopic species are reviewed to show what kind of information could be obtained with high‐resolution spectroscopic techniques. The current status on a most challenging species in this field, CH 5 + , is described. Applications to and implications from astronomical observations are also described wherever they are relevant to spectroscopy.

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Time-resolved Fourier transform infrared spectroscopy: Application to pulsed discharges

Cited by 26 publications

References 42 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

High-resolution spectroscopy and quantum-defect model for the gerade triplet np and nf Rydberg states of He2

High‐resolution Microwave and Infrared Spectroscopy of Molecular Cations

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Time-resolved Fourier transform infrared spectroscopy: Application to pulsed discharges

Cited by 26 publications

References 42 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

High-resolution spectroscopy and quantum-defect model for the gerade triplet np and nf Rydberg states of He2

High‐resolution Microwave and Infrared Spectroscopy of Molecular Cations

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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