In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
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Ultrafast processes in matter, such as the electron emission following light absorption, can now be studied using light pulses of attosecond duration in the extreme ultraviolet spectral range. However, the short temporal duration of these pulses implies a large energy spread of the photoelectrons according to Heisenberg’s uncertainty principle. Indeed, the lack of spectral resolution due to the use of short pulses has raised issues in the interpretation of the experimental results in comparison with theoretical calculations. Here, we present new experimental results on the long-standing problem of photoionization time delays in neon atoms that were originally measured by Schultze and co-workers using isolated attosecond pulses 1. Using our alternative approach 2, based on attosecond pulse trains, we gain both high temporal and spectral resolution by photoelectron interferometry. This allows us to spectrally disentangle direct ionization from ionization with shake-up, in which a second electron is left in an excited state, and obtain excellent agreement with theoretical calculations based on diagrammatic many-body perturbation theory 3. In this way we have solved a 7-year-old puzzle in attosecond science.
1. Schultze, M. et al. Delay in Photoemission. Science (80-. ). 328, 1658–1662 (2010).
2. Isinger, M. et al. Photoionization in the time and frequency domain. Science (80-. ). (2017). doi:10.1126/science.aao7043
3. Dahlström, J. M., Carette, T. & Lindroth, E. Diagrammatic approach to attosecond delays in photoionization. Phys. Rev. A 86, 61402 (2012).