Attosecond transient absorption of a bound wave packet coupled to a smooth continuum
- Lund Univ., Lund (Sweden); Stockholm Univ., Stockholm (Sweden)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Stockholm Univ., Stockholm (Sweden)
Here, 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. 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 $$-\pi /2$$ 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.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1410602
- Journal Information:
- Journal of Optics, Journal Name: Journal of Optics Journal Issue: 11 Vol. 19; ISSN 2040-8978
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
| Pulse analysis by delayed absorption from a coherently excited atom 
 | journal | January 2019 | 
| Emerging attosecond technologies 
 | journal | October 2018 | 
| Attosecond precision in delay measurements using transient absorption spectroscopy 
 | journal | January 2019 | 
| Pulse analysis by delayed absorption from a coherently excited atom | preprint | January 2018 | 
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