Modern Experimental Techniques in Ultrafast Atomic and Molecular Physics

Madhusudhan, P.; Das, Rituparna; Bharadwaj, Pranav; Chandravanshi, Pooja; Soumyashree, Swetapuspa; Nimma, Vinitha; Kushawaha, Rajesh K.

doi:10.1007/978-981-33-6084-6_10

Cited by 2 publications

(2 citation statements)

References 60 publications

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“…The pulse width of the laser is continuously monitored using a spectral phase interferometer (SPIDER from APE, Germany) during the experiment. Characterization of the pulse has been reported previously (Madhusudhan et al 2021) and thus not discussed here. The generation of orthogonal twocolor (OTC) and parallel two-color (PTC) laser fields and a brief technical report on velocity map imaging (VMI) spectrometer are discussed in the following sections.…”

Section: Experimental Schemementioning

confidence: 99%

Strong-field ionization of N₂ and CO molecules using two-color laser field

Madhusudhan¹,

Das²,

Bhardwaj³

et al. 2022

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

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Two-color strong-field photoionization of two diatomic molecules (N$_2$, CO) is studied using a Velocity Map Imaging (VMI) spectrometer. The fundamental frequency, along with the second harmonic (800 + 400 nm) at different phases, with the two different polarization schemes viz, orthogonal and parallel, is employed for measuring the ion yields and photoelectron momentum distributions. The yield of the parent ion and its charged fragments as a function of the phase difference between the two-color field has been studied thoroughly, and the results are presented here. The correlation trends of the parent ion with their fragments as a function of the relative phase are discussed. It is observed that the ionized CO and its fragments have different correlation trends at different polarization schemes. Additionally, the photoelectron momentum distribution of N$_2$ and CO due to orthogonal two-color (OTC) and parallel two-color (PTC) is performed in order to understand the modulation of electron dynamics as a function of phase between 800 nm and 400nm. Further, the asymmetry parameter as a function of electron momenta due to the two-color fields has been estimated and discussed.

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Section: Experimental Schemementioning

confidence: 99%

Strong-field ionization of N₂ and CO molecules using two-color laser field

Madhusudhan¹,

Das²,

Bhardwaj³

et al. 2022

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

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“…The pulse width of the incident beam just before the focusing lens was characterized using a spectral phase interferometer (SPIDER from APE, Germany). Characterization of the pulse has been reported previously (Madhusudhan et al 2021) and thus not discussed here. The light from the FIP has been collected at an optic axis of about 45 o from the laser system using a UV-NIR coated collection optics and a high-resolution ICCD coupled echelle spectrometer.…”

Section: Experimental Schemementioning

confidence: 99%

Molecular emission dynamics from a femtosecond filament induced plasma plume

Shameem¹,

Madhusudhan²,

Das³

et al. 2022

J. Opt.

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In this study, we investigated the filament-induced plasma properties and the associated molecular emission features from three different non-metallic samples. Graphite, PMMA, and Teflon samples have been ablated using a tightly focused filament, and their emission spectra were analyzed using a time-integrated optical emission spectroscopy technique. The temporal responses and evolution dynamics of molecular species such as CN and C2 from these samples in ambient conditions are compared. The tightly focused filament was generated by focusing the Ti: Sapphire femtosecond pulses having a pulse duration of 29 fs using a short focal length external focusing system. The time-integrated ICCD images of air filament show that the filament survives up to a few nanosecond time duration after the onset of air plasma. The influence of physical and chemical properties of the samples during filament ablation has also been studied by characterizing the optical emission spectra. We find that the molecular signal intensity strongly depends on the sample properties and the position of the sample in the filament. The increase in molecular emission intensity from a graphite sample as a function of incident laser intensity suggests that the tightly focused filament surpasses the intensity clamping value.

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Modern Experimental Techniques in Ultrafast Atomic and Molecular Physics

Cited by 2 publications

References 60 publications

Strong-field ionization of N₂ and CO molecules using two-color laser field

Strong-field ionization of N₂ and CO molecules using two-color laser field

Molecular emission dynamics from a femtosecond filament induced plasma plume

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Modern Experimental Techniques in Ultrafast Atomic and Molecular Physics

Cited by 2 publications

References 60 publications

Strong-field ionization of N2 and CO molecules using two-color laser field

Strong-field ionization of N2 and CO molecules using two-color laser field

Molecular emission dynamics from a femtosecond filament induced plasma plume

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Strong-field ionization of N₂ and CO molecules using two-color laser field

Strong-field ionization of N₂ and CO molecules using two-color laser field