Predissociation in b 1Πu,v (v=1,4,5,6) levels of N2

Ubachs, Wim; Velchev, I.; Lange, A. de

doi:10.1063/1.481145

Cited by 32 publications

(33 citation statements)

References 25 publications

(37 reference statements)

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“…Here, we conclude that the estimate of the instrument width in Ref. 16 was too optimistic. The picosecond XUV laser at Lund certainly provides much better accuracy for lifetimes in the dynamic range Ͼ500 ps, and hence the present value should be more trustworthy.…”

Section: Resultsmentioning

confidence: 70%

“…25͒ and 1100 Ϯ300 ps. 16 In the latter study, the linewidths of single rotational levels were investigated. In Ref.…”

Section: Resultsmentioning

confidence: 99%

“…In Ref. 16, it was stated that the wavelength resolution of the XUV laser was barely sufficient to enable the deconvolution of molecular lifetime effects from the observed widths. Furthermore, the possibility of hyperfine structure should be considered.…”

Section: Resultsmentioning

confidence: 99%

“…1, we show a pump-probe delay scan for the b(vϭ4) state of N 2 which is known to have a lifetime of 11-18 ps. 13,16 The resulting convoluted width of 107 ps full-width at half-maximum ͑FWHM͒ represents, in fact, the instrument function of our pump-probe setup in the temporal domain. This value is in good agreement with an actual measurement of pulse durations by a streak camera yielding a convoluted width of 95 ps.…”

Section: Experimental Methods and Data Analysismentioning

confidence: 99%

“…Linewidths for the lower-energy 1 ⌸ u states, including the low-v levels of the b state, were determined by Leoni and Dressler 12 who analyzed photoelectric scans of the absorption bands taken at many pressures. Predissociation lifetimes for excited states of 1 ⌸ u symmetry were determined by Ubachs and co-workers [13][14][15][16] using narrowband XUV-laser excitation, while Kawamoto et al 17 studied predissociation of the c 3 (vϭ1) level using near-infrared excitation from the long-lived aЉ 1 In the present study, a picosecond laser system is used in a pump-probe configuration to study the lifetime of the b 1 ⌸ u (vϭ1) level in 14 N 2 . This study follows previous work 26 on lifetime measurements for the c 4 Ј 1 ⌺ u ϩ (vϭ0 -2) states of 14 N 2 and is part of a collaborative experimental and theoretical program intended to unravel the Rydberg-valence and singlet-triplet interactions of N 2 in the 100 000-110 000 cm Ϫ1 region.…”

Section: Introductionmentioning

confidence: 99%

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Lifetime and predissociation yield of N214 b 1Πu(v=1)

Sprengers

Ubachs

Johansson

et al. 2004

The Journal of Chemical Physics

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The lifetime of the b 1 ⌸ u (vϭ1) state in 14 N 2 has been determined experimentally using a laser-based pump-probe scheme and an exceptionally long lifetime of 2.61 ns was found. Semiempirical close-coupling calculations of the radiative lifetime, which include Rydberg-valence interactions in the singlet manifold, are consistent with this large value, giving a value of 3.61 ns and suggesting a predissociation yield of ϳ28% for this level of the b state.

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Section: Resultsmentioning

confidence: 70%

“…25͒ and 1100 Ϯ300 ps. 16 In the latter study, the linewidths of single rotational levels were investigated. In Ref.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methods and Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lifetime and predissociation yield of N214 b 1Πu(v=1)

Sprengers

Ubachs

Johansson

et al. 2004

The Journal of Chemical Physics

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Precision Laser Spectroscopy in the Extreme Ultraviolet

Eikema

Ubachs

2011

Handbook of High‐resolution Spectroscopy

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Techniques for the production of short wavelengths in the extreme ultraviolet wavelength range are described, spanning low‐order harmonic generation in the perturbative regime for narrow bandwidth XUV production to the plateau‐regime with the three‐step collisional model for the generation of high harmonics with broadband ultrafast pulses. In addition, the intermediate regime is discussed for pulses of 300 ps duration, as well as the regime of harmonic conversion based on continuous wave lasers aiming at the production of coherent Lyman‐α radiation. Applications of XUV sources in the frequency domain typically rely on the production of XUV‐light from narrowband Fourier‐transform‐limited pulses for recording high‐resolution spectra. Alternatively, harmonically upconverted pulses of ultrashort duration (with inter‐pulse coherence) can be used for spectroscopic studies in the time and frequency domain (such as direct frequency comb spectroscopy techniques). Examples of both approaches for atomic and molecular spectroscopy are discussed at some length. For precision metrology on atomic systems, a focus is put on the Lamb shift determination in the He ground state. In the realm of molecular spectroscopy, predissociation phenomena in the nitrogen molecule are highlighted, with relevance for dissociation processes occurring in the upper layers of the Earth atmosphere. Similar predissociation phenomena in carbon monoxide are also treated in some detail, in this case with relevance for the chemistry in interstellar clouds. Precision XUV spectroscopy of molecular hydrogen is discussed as well, as it relates to the possibility of detecting a variation of the proton–electron mass ratio on a cosmological time scale. In the last section, applications of direct frequency comb spectroscopic techniques at short wavelengths are explained and prospects are given for using these techniques at extreme ultraviolet wavelengths.

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Frequency-mixing scheme for the production of tunable narrowband XUV radiation (91–95 nm): application to precision spectroscopy and predissociation in diatomic molecules

et al. 2004

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(v , 0) Werner bands for v = 0-4, using a narrow-band tunable extreme UV laser source at wavelengths λ = 92-105 nm in conjunction with the technique of 1 + 1 two-photon ionization. The measurements can be divided into three categories for which varying absolute accuracies were obtained. Special focus was on the B, v = 2-5 bands, where an accuracy of 0.004 cm −1 or δν/ν = 4 × 10 −8 is achieved. For transitions to B, v ≤ 13 and C, v ≤ 3 states the accuracy is 0.005 cm −1 or δν/ν = 5 × 10 −8 . Due to a different frequency mixing scheme uncertainties for B, v ≥ 13 and C, v = 4 are at the level of 0.011 cm −1 or δν/ν = 1.1 × 10 −7 . Inspection of combination differences between R(J ) and P(J + 2) lines shows that the accuracies are even better than estimated in the error budget. Based on the measurements of 138 spectral lines and the known combination differences, transition frequencies of 60 P-lines could be calculated as well, so that a data base of 198 accurately calibrated lines results for the Lyman and Werner bands of H 2 .Key words: vacuum UV, molecular spectroscopy, hydrogen, precision metrology. . Un examen des différences des combinaisons entre les raies R(J ) et P(J + 2) montre que les précisions sont meilleures que celles évaluées dans le budget des erreurs. Sur la base de mesures de 138 raies spectrales et de différences de combinaison connues, on a pu aussi calculer les fréquences de transition de 60 raies P et il en résulte qu'une base de données de 198 raies bien calibrées est disponible pour les bandes de Lyman et de Werner du H 2 .

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Predissociation in b 1Πu,v (v=1,4,5,6) levels of N2

Cited by 32 publications

References 25 publications

Lifetime and predissociation yield of N214 b 1Πu(v=1)

Lifetime and predissociation yield of N214 b 1Πu(v=1)

Precision Laser Spectroscopy in the Extreme Ultraviolet

Frequency-mixing scheme for the production of tunable narrowband XUV radiation (91–95 nm): application to precision spectroscopy and predissociation in diatomic molecules

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