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Title: Attosecond transient absorption of argon atoms in the vacuum ultraviolet region: line energy shifts versus coherent population transfer

Journal Article · · New Journal of Physics
 [1];  [2];  [2];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
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Using attosecond transient absorption, the dipole response of an argon atom in the vacuum ultraviolet (VUV) region is studied when an external electromagnetic field is present. An isolated attosecond VUV pulse populates Rydberg states lying 15 eV above the argon ground state. A synchronized few-cycle near infrared (NIR) pulse modifies the oscillating dipoles of argon impulsively, leading to alterations in the VUV absorption spectra. As the NIR pulse is delayed with respect to the VUV pulse, multiple features in the absorption profile emerge simultaneously including line broadening, sideband structure, sub-cycle fast modulations, and 5-10 fs slow modulations. These features indicate the coexistence of two general processes of the light-matter interaction: the energy shift of individual atomic levels and coherent population transfer between atomic eigenstates, revealing coherent superpositions. Finally, an intuitive formula is derived to treat both effects in a unifying framework, allowing one to identify and quantify the two processes in a single absorption spectrogram.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1415950
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 1 Vol. 18; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

The role of transition dipole phase in atomic attosecond transient absorption from the multi-level model journal September 2019
Autoionization dynamics of ( 2 P 1/2 ) ns/d states in krypton probed by noncollinear wave mixing with attosecond extreme ultraviolet and few-cycle near infrared pulses journal September 2019
The role of transition dipole phase in atomic attosecond transient absorption from the multi-level model journal September 2019
Analytical theory of attosecond transient absorption spectroscopy of perturbatively dressed systems journal January 2020
Attosecond transient-absorption dynamics of xenon core-excited states in a strong driving field journal March 2017
Attosecond transient absorption spectrum of argon at the L 2 , 3 edge journal March 2018
Attosecond optics and technology: progress to date and future prospects [Invited] journal January 2016
Four-wave mixing of extreme ultraviolet pulses and infrared pulses for studies of atomic dynamics journal January 2019
Analytical Theory of Attosecond Transient Absorption Spectroscopy of Perturbatively Dressed Systems text January 2019
Ultrafast Mid-IR Laser Pulses Generation via Chirp Manipulated Optical Parametric Amplification journal May 2018
Analytical Theory of Attosecond Transient Absorption Spectroscopy of Perturbatively Dressed Systems journal March 2019

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Rydberg states
Stark shift
attosecond transient absorption
population transfer