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Related Concept Videos

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training07:40

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Here, we present protocols of high-intensity interval and moderate-intensity continuous exercise to observe the response of circulating cardiac troponin T (cTnT) concentration to acute exercise over 10 days. The information may assist with clinical interpretations of post-exercise cTnT elevation and guide the prescription of...
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The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
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A growing number of radiation therapy devices offer the advantage of delivering the dose through very small beams to the tumor, allowing for increased conformity and higher doses per fraction. Many different detectors can be used for the dosimetry of these small fields. In the present study, the effect of ion recombination is investigated for a liquid ionization chamber using a stereotactic radiation therapy...
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Related Experiment Video

Updated: Jan 19, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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Relativistic Nondipole Effects in Strong-Field Atomic Ionization at Moderate Intensities.

Nida Haram1, Igor Ivanov2, Han Xu1

  • 1Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.

Physical Review Letters
|September 17, 2019
PubMed
Summary

Relativistic nondipole effects in atomic ionization were studied using intense laser pulses. Counterintuitive peak shifts in electron momentum were observed, matching theoretical predictions.

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Strong-Field Physics

Background:

  • Relativistic effects are crucial in strong-field atomic ionization.
  • Nondipole effects become significant at high laser intensities.
  • Few-cycle laser pulses offer unique temporal control over ionization dynamics.

Purpose of the Study:

  • To experimentally and theoretically investigate relativistic nondipole effects in atomic ionization.
  • To analyze photoelectron momentum distributions under intense few-cycle laser fields.
  • To compare experimental data with ab initio relativistic theoretical predictions.

Main Methods:

  • High-resolution photoelectron momentum distributions were measured using a reaction microscope.
  • Argon atoms were ionized by near-infrared linearly polarized few-cycle laser pulses.
  • A fully relativistic 3D time-dependent Dirac equation model was employed for theoretical analysis.

Main Results:

  • Observed counterintuitive peak shifts in the transverse electron momentum distribution.
  • These shifts were found to be intensity-dependent.
  • Excellent agreement was demonstrated between experimental measurements and theoretical predictions.

Conclusions:

  • Relativistic nondipole effects play a significant role in strong-field atomic ionization.
  • The observed peak shifts provide a sensitive probe of these relativistic effects.
  • The validated theoretical model accurately describes the complex ionization dynamics.