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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Dissecting Strong-Field Excitation Dynamics with Atomic-Momentum Spectroscopy.

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  • 1Australian National University, Canberra ACT 2601, Australia.

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|July 1, 2020
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Summary
This summary is machine-generated.

We propose using atomic motion to monitor quantum dynamics within atoms and molecules interacting with intense laser fields. This method allows for femtosecond-level reconstruction of strong-field excitation processes.

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Area of Science:

  • Quantum Dynamics
  • Strong-Field Physics
  • Atomic and Molecular Physics

Background:

  • Observing internal quantum dynamics requires understanding correlations with measurement apparatus.
  • Nonperturbative laser fields present challenges for monitoring atomic and molecular internal dynamics.

Purpose of the Study:

  • To propose a novel method for observing internal quantum dynamics using the center-of-mass (c.m.) degrees of freedom of atoms and molecules.
  • To demonstrate this method on a hydrogen atom in an intense infrared laser field.

Main Methods:

  • Development of a numerically tractable, quantum-mechanical treatment for internal and c.m. dynamics correlations.
  • Utilizing transverse momentum as a record of excited state interactions with the laser field.

Main Results:

  • Femtosecond reconstruction of strong-field excitation processes is achieved by analyzing transverse momentum.
  • Observation of the ground state becoming weak-field seeking, a signature of the Kramers-Henneberger regime.

Conclusions:

  • The c.m. motion of atoms and molecules can serve as an intrinsic probe for their internal quantum dynamics.
  • This approach provides a new pathway for studying quantum phenomena in strong laser fields.