Attosecond transient absorption of a bound wave packet coupled to a smooth continuum
(2017) In Journal of Optics (United Kingdom) 19(11).- Abstract
We investigate the possibility of using transient absorption of a coherent bound electron wave packet in hydrogen as an attosecond pulse characterization technique. In a recent work, we have shown that photoionization of such a coherent bound electron wave packet opens up for pulse characterization with unprecedented temporal accuracy - independent of the atomic structure - with maximal photoemission at all kinetic energies given a wave packet with zero relative phase (Pabst and Dahlström Phys. Rev. A 94 13411 (2016)). Here, we perform numerical propagation of the time-dependent Schrödinger equation and analytical calculations based on perturbation theory to show that the energy-resolved maximal absorption of photons from the attosecond... (More)
We investigate the possibility of using transient absorption of a coherent bound electron wave packet in hydrogen as an attosecond pulse characterization technique. In a recent work, we have shown that photoionization of such a coherent bound electron wave packet opens up for pulse characterization with unprecedented temporal accuracy - independent of the atomic structure - with maximal photoemission at all kinetic energies given a wave packet with zero relative phase (Pabst and Dahlström Phys. Rev. A 94 13411 (2016)). Here, we perform numerical propagation of the time-dependent Schrödinger equation and analytical calculations based on perturbation theory to show that the energy-resolved maximal absorption of photons from the attosecond pulse does not uniquely occur at a zero relative phase of the initial wave packet. Instead, maximal absorption occurs at different relative wave packet phases, distributed as a non-monotonous function with a smooth -π/2 shift across the central photon energy (given a Fourier-limited Gaussian pulse). Similar results are also found in helium. Our finding is surprising, because it implies that the energy-resolved photoelectrons are not mapped one-to-one with the energy-resolved absorbed photons of the attosecond pulse.
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- author
- Dahlström, Jan Marcus LU ; Pabst, Stefan and Lindroth, Eva
- organization
- publishing date
- 2017-10-16
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- ATAS, attosecond, continuum transition, pulse characterization, transient absorption
- in
- Journal of Optics (United Kingdom)
- volume
- 19
- issue
- 11
- article number
- 114004
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85032840389
- wos:000413318300001
- ISSN
- 2040-8978
- DOI
- 10.1088/2040-8986/aa8a93
- language
- English
- LU publication?
- yes
- id
- c8280a11-0188-4462-adf3-949d6096cb2e
- date added to LUP
- 2017-11-15 08:21:38
- date last changed
- 2024-04-14 21:37:22
@article{c8280a11-0188-4462-adf3-949d6096cb2e,
abstract = {{<p>We investigate the possibility of using transient absorption of a coherent bound electron wave packet in hydrogen as an attosecond pulse characterization technique. In a recent work, we have shown that photoionization of such a coherent bound electron wave packet opens up for pulse characterization with unprecedented temporal accuracy - independent of the atomic structure - with maximal photoemission at all kinetic energies given a wave packet with zero relative phase (Pabst and Dahlström Phys. Rev. A 94 13411 (2016)). Here, we perform numerical propagation of the time-dependent Schrödinger equation and analytical calculations based on perturbation theory to show that the energy-resolved maximal absorption of photons from the attosecond pulse does not uniquely occur at a zero relative phase of the initial wave packet. Instead, maximal absorption occurs at different relative wave packet phases, distributed as a non-monotonous function with a smooth -π/2 shift across the central photon energy (given a Fourier-limited Gaussian pulse). Similar results are also found in helium. Our finding is surprising, because it implies that the energy-resolved photoelectrons are not mapped one-to-one with the energy-resolved absorbed photons of the attosecond pulse.</p>}},
author = {{Dahlström, Jan Marcus and Pabst, Stefan and Lindroth, Eva}},
issn = {{2040-8978}},
keywords = {{ATAS; attosecond; continuum transition; pulse characterization; transient absorption}},
language = {{eng}},
month = {{10}},
number = {{11}},
publisher = {{IOP Publishing}},
series = {{Journal of Optics (United Kingdom)}},
title = {{Attosecond transient absorption of a bound wave packet coupled to a smooth continuum}},
url = {{http://dx.doi.org/10.1088/2040-8986/aa8a93}},
doi = {{10.1088/2040-8986/aa8a93}},
volume = {{19}},
year = {{2017}},
}