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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
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Cryogenic Liquid Jets for High Repetition Rate Discovery Science
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Nm-sized cryogenic hydrogen clusters for a laser-driven proton source.

S Grieser1, B Aurand2, E Aktan2

  • 1Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.

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A new cryogenic hydrogen cluster-jet target enables continuous operation with high-repetition lasers for laser-plasma studies, preventing target debris and showing proton acceleration. This system is ideal for advanced laser-driven particle acceleration research.

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Area of Science:

  • Plasma Physics
  • Laser-Matter Interaction
  • Accelerator Technology

Background:

  • Laser-plasma interaction studies require advanced target systems.
  • Pulsed high-repetition lasers necessitate targets compatible with continuous operation and minimal debris.
  • Existing targets may not meet the demands of high-power laser systems.

Purpose of the Study:

  • To describe a novel cryogenic hydrogen cluster-jet target for laser-plasma interaction studies.
  • To characterize the cluster-jet target's properties, including cluster size and beam density.
  • To demonstrate the target's utility with a high-power laser system and observe particle acceleration.

Main Methods:

  • Characterization of the cryogenic hydrogen cluster-jet using Mie-scattering.
  • Estimation of the cluster beam density.
  • Implementation of the target at the ARCTURUS high-power laser system.

Main Results:

  • The cluster-jet target is compatible with pulsed high-repetition lasers and produces no target debris.
  • Mie-scattering measurements allowed determination of cluster size, consistent with empirical formulas.
  • Proton acceleration was observed following irradiation of the cluster target by high-intensity laser pulses at a 5 Hz repetition rate.

Conclusions:

  • The cryogenic hydrogen cluster-jet target is a viable and advantageous system for laser-plasma interaction studies.
  • The target's continuous operation and debris-free nature are significant benefits for high-repetition rate laser experiments.
  • The observed proton acceleration validates the system's effectiveness in laser-driven particle acceleration.