Characterization of ammonia-water clusters by broadband rotational spectroscopy
Evangelisti, Luca
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https://hdl.handle.net/2142/91449
Description
Title
Characterization of ammonia-water clusters by broadband rotational spectroscopy
Author(s)
Evangelisti, Luca
Contributor(s)
Pate, Brooks
Shields, George C.
Temelso, Berhane
Perez, Cristobal
Issue Date
2016-06-23
Keyword(s)
Clusters/Complexes
Abstract
Neon carrier gas at 0.3 MPa of backing pressure is flowed over a room-temperature ammonia hydroxide solution before being expanded into a chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer operating between 2 and 8 GHz. A dense spectrum was observed and the investigation allowed unambiguous assignment of the (NH$_{3}$)$_{2}$(H$_{2}$O)$_{n}$ with n=1,2 and NH$_{3}$(H$_{2}$O)$_{n}$ with n=2,3,4,5,6,8 with a signal to noise of at least 3:1. The structures show a cyclic arrangement for clusters with up four monomer and then move to a 3D arrangement. These clusters are of interest because of the different possibilities for hydrogen bond network related to the isolated water clusters. Calculations indicate that there are several possible low-energy isomers, with different levels of theory identifying different isomers as the global minimum. The evidence for the assignment and a discussion of the derived properties for the species are presented.
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