Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Femtosecond Spectroscopy 2

MO 7.6: Talk

Tuesday, March 1, 2016, 12:30–12:45, f102

Detection of multiple-quantum coherences in dilute samples — •Lukas Bruder, Marcel Binz, Ulrich Bangert, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, 79104 Freiburg

Multidimensional spectroscopy allows efficient isolation and detection of multiple-quantum coherences (MQCs). MQC signals have been used to explore higher-lying molecular states and many-body phenomena in various systems. Detecting such higher order effects usually requires particularly sensitive methods. We present a simple approach based on quasi-continuous phase modulation which allows efficient isolation of MQC signals in a collinear two-pulse experiment [1]. We demonstrate the detection of multiphoton quantum beats in atomic vapors and supersonic doped helium droplet beams. Furthermore, collective resonances up to the 5th order are observed, which is surprising considering the low density in our samples. The origin of these features is currently investigated. Our approach can readily be extended to higher dimensional spectroscopy. Moreover, it may facilitate coherent time-resolved spectroscopy in the XUV spectral range.

[1] L. Bruder, M. Binz, and F. Stienkemeier, Phys. Rev. A 92, 053412 (2015).