Post date: May 26, 2015 4:28:01 AM
Dr. Luca Castiglioni (U. Zurich) visited NAIST and gave us a very interesting and nice talk about Rabbit experiment, which is photoelectron spectroscopy using attosecond laser pulse train and IR.
[1] A. L. Cavalieri et al. Nature 449, 1029 (2007)
[2] R. Locher et al. rev. Sci. Instr. 85 013113 (2014)
[3] R. Locher, L. Castiglioni et al. Optica, 2, 405 (2015)
notes:
It takes 24 attoseconds for 1s electron to run around the H nucleus (=hbar/EH=hbar/2Ry=hbar/27eV)).
Ti sapphire laser 800nm light requires 2.8fs for one oscillation.
20-50eV photon requires around 100as for one oscillation.
Attosecond streak camera method was published in PRL 88 173903 (2002)
Time resolved photoemission experiments;
2PPE (hv1, hv2 <Phi) ,
tr-ARPES (hv1<Phi<hv2)
Rabbit( hv1 pulse train (High Harmonic 10-30eV ), hv2 800nm( Side Bands))
Rabbit uses 800nm Ti sapphire laser. The laser is separated into two paths. One of them hit rare gas to generate high harmonic attosecond pulse train. The other path contains delay path. Both high harmonic and the delayed IR hit the sample in front of PES analyser (Phoibos). The delay of IR tuned in the delay path in respect to the pulse train is used as horizontal axis of the Rabbit data.
Strange phenomena;
Time delay of the photoelectron from f and conduction of tangusten differs by 110fs.
This time delay seems to depend on materials and photon energy[3].
Paul et al. Nature 292 1689 (2001)
Sobota et al. PRL 108 117403 (2012)