Real-time observation of electronic, vibrational, and rotational dynamics in nitric oxide with attosecond soft X-ray pulses at 400 eV

Saito, Nariyuki; Sannohe, Hiroki; Ishii, Nobuhisa; Kanai, Teruto; Kosugi, Nobuhiro; Wu, Yi; Chew, Andrew; Han, Seunghwoi; Chang, Zenghu; Itatani, Jiro

doi:10.48550/arxiv.1904.10456

Cited by 2 publications

(3 citation statements)

References 25 publications

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“…The demonstration of the increased photon flux using a short SWIR wavelength and a long HHG medium represents an important step towards the observation of attosecond dynamics in solution phase with transient absorption in the water window 55 . The dual-wavelength approach furthermore allows the strong-field excitation of molecules 4,34,38 or single-photon pumping across a majority of semiconductor bandgaps 8,9 , including 2D semiconductors 56 . The broadband, few-cycle vis-NIR pulse could additionally be upconverted to few-fs tunable UV pulses 57 , opening new possibilities for the study of ultrafast excited-state dynamics in molecules [58][59][60] .…”

Section: Discussionmentioning

confidence: 99%

“…Due to the smaller photon energy in the SWIR, using a similar approach for SXR transient absorption considerably reduces the pumping excitation capabilities. Note however that field-driven carrier motion in a semi-metal 33 and tunnel ionization of a low ionization potential molecule 34 with 𝜆𝜆 > 1600 nm few-cycle pulses have recently been observed.…”

Section: Introductionmentioning

confidence: 99%

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Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Barreau

Ross

Garg

et al. 2020

Sci Rep

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We present a table-top beamline providing a soft X-ray supercontinuum extending up to 350 eV from high-order harmonic generation with sub-13 fs 1300 nm driving pulses and simultaneous production of sub-5 fs pulses centered at 800 nm. Optimization of the high harmonic generation in a long and dense gas medium yields a photon flux of ~2 x 10 7 photons/s/1% bandwidth at 300 eV. The temporal resolution of X-ray transient absorption experiments with this beamline is measured to be 11 fs for 800 nm excitation. This dual-wavelength approach, combined with high flux and high spectral and temporal resolution soft X-ray absorption spectroscopy, is a new route to the study of ultrafast electronic dynamics in carbon-containing molecules and materials at the carbon K-edge. 2/10 Description of the table-top dual-wavelength beamlineThe beamline is summarized in Figure 1. It uses a 13 mJ , 800 nm, 30 fs, 1 kHz Ti:Sapphire laser (Coherent Legend Elite Duo), whose energy is split into 11 mJ +2 mJ to produce the probe and pump pulses, respectively, used in time-resolved X-ray transient absorption experiments. This section details the simultaneous compression of SWIR (centered at 1300 nm or 1400 nm) and visible-near infrared (centered at 800 nm) pulses, and the characteristics of the soft X-ray spectrometer. Production of few-cycle short-wave infrared pulsesThe few-cycle pulses centered at 1300 nm in the SWIR are produced using an OPA followed by spectral broadening in a hollow-core fiber filled with a rare gas 35 and compression with chirped mirrors 36 . The 11 mJ 800 nm beam is further split into 0.5 mJ and 10.5 mJ for use in a two-stage OPA, which converts the 800 nm to SWIR (1300 nm). The two-stage system is obtained from Light Conversion and is designed to provide CEP stability of the signal pulses. The first stage is a low energy OPA (TOPAS Prime), pumped by 0.5 mJ, which provides 90 J of 2 m pulses in the idler. Due to the parametric amplification process, the idler pulses are passively CEP stabilized, with a stability of <200 mrad. They are then used as the seed for the white light generation in a second, high energy, OPA (HE-TOPAS) pumped with the remaining 10.5 mJ of 800 nm light. This design should ensure the CEP stability of the signal pulses over the 1200-1600 nm tunable range of the OPA, regardless of the CEP stability of the pump laser. However, the following results are obtained with a CEP-averaged signal pulse. The 2.8 mJ, 1300 nm, 40 fs output is focused with a 2-m focusing mirror to a focal size of 390 m (at 1/e 2 ) at the entrance of a 3-m-long, 700-m-inner diameter stretched hollow-core fiber (HCF) filled with 0.4 bar of argon (Few-Cycle Inc.). The ratio of beam

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Barreau

Ross

Garg

et al. 2020

Sci Rep

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show abstract

“…Generating HHG with these two types of novel systems it has been possible to generate soft x-ray pulses with durations around 50 as 14,15 . Very recently, attosecond transient absorption spectroscopy at the Nitrogen K-edge (400 eV) and Titanium L-edge ( 460 eV) has been demonstrated with both OPAs and OPCPAs 16,17 .…”

mentioning

confidence: 99%

Generation of 3 mJ, 44 fs, 2.5 micrometer pulses from a single-stage Cr2+:ZnSe amplifier

Wu,

Zhou,

Larsen

et al. 2019

Preprint

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Real-time observation of electronic, vibrational, and rotational dynamics in nitric oxide with attosecond soft X-ray pulses at 400 eV

Cited by 2 publications

References 25 publications

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Generation of 3 mJ, 44 fs, 2.5 micrometer pulses from a single-stage Cr2+:ZnSe amplifier

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