Abstract
Helium nanodroplet isolation (HENDI) spectroscopy involves the use of a beam of He n (103 < n < 105) nanodroplets which are doped while passing, largely undeflected, through a pick-up cell containing the low pressure vapor of the substance to be examined. The nanodroplets carry the dopant species downstream, where they can be spectroscopically interrogated. After briefly reviewing the field and providing a few examples of applications, in this paper we show that HENDI is also useful in producing collimated beams of cold, gas-phase molecules which, after forming on the cold droplet’s surface, spontaneously desorb from it at very low velocities. As this low desorption velocity is added to the relatively large average velocity of the droplets, the desorbed molecules fly forward as part of the main beam and can be used to obtain sub-doppler high resolution spectra. Three examples of applications of this new technique will be reported here showing the spectrum of a well known molecule (ground state Na2), that of a less well known molecule (lowest triplet state Na2) and a third spectrum which is tentatively assigned to a yet unknown molecule: Na2 He.
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Higgins, J.P., Reho, J., Stienkemeier, F., Ernst, W.E., Lehmann, K.K., Scoles, G. (2001). Spectroscopy in, on, and off a Beam of Superfluid Helium Nanodroplets. In: Campargue, R. (eds) Atomic and Molecular Beams. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56800-8_51
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DOI: https://doi.org/10.1007/978-3-642-56800-8_51
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