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Rotational coherence of encapsulated ortho and para water in fullerene-C60 revealed by time-domain terahertz spectroscopy

Rotational coherence of encapsulated ortho and para water in fullerene-C60 revealed by time-domain terahertz spectroscopy
Rotational coherence of encapsulated ortho and para water in fullerene-C60 revealed by time-domain terahertz spectroscopy
We resolve the real-time coherent rotational motion of isolated water molecules encapsulated in fullerene-C60 cages by time-domain terahertz (THz) spectroscopy. We employ single-cycle THz pulses to excite the low-frequency rotational motion of water and measure the subsequent coherent emission of electromagnetic waves by water molecules. At temperatures below ~100 K, C60 lattice vibrational damping is mitigated and the quantum dynamics of confined water are resolved with a markedly long rotational coherence, extended beyond 10 ps. The observed rotational transitions agree well with low-frequency rotational dynamics of single water molecules in the gas phase. However, some additional spectral features with their major contribution at ~2.26 THz are also observed which may indicate interaction between water rotation and the C60 lattice phonons. We also resolve the real-time change of the emission pattern of water after a sudden cooling to 4 K, signifying the conversion of ortho-water to para-water over the course of 10s hours. The observed long coherent rotational dynamics of isolated water molecules confined in C60 makes this system an attractive candidate for future quantum technology.
2045-2322
Zhukov, Sergey S.
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Balos, Vasileios
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Hoffman, Gabriela
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Alom, Shamim
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Belyanchikov, Mikhail
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Nebioglu, Mehmet
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Roh, Seulki
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Pronin, Artem
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Bacanu, George Razvan
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Abramov, Pavel
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Wolf, Martin
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Dressel, Martin
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Levitt, Malcolm H.
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Whitby, Richard J.
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Gorshunov, Boris
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Sajadi, Mohsen
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Zhukov, Sergey S.
0c75e162-ce33-4809-a034-d2e31be3999d
Balos, Vasileios
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Hoffman, Gabriela
8b98ba1c-ee09-4922-82e4-a9240aa12e64
Alom, Shamim
f6b56fb1-7f94-432a-87cd-887f6e5d9f64
Belyanchikov, Mikhail
bc7028ff-0899-4aee-b3e2-76c8412ee1c2
Nebioglu, Mehmet
c7d6a895-5f68-4372-96a3-8860b7402917
Roh, Seulki
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Pronin, Artem
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Bacanu, George Razvan
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Abramov, Pavel
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Wolf, Martin
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Dressel, Martin
087f35b7-362d-4d20-a799-29efd923a676
Levitt, Malcolm H.
bcc5a80a-e5c5-4e0e-9a9a-249d036747c3
Whitby, Richard J.
45632236-ab00-4ad0-a02d-6209043e818b
Gorshunov, Boris
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Sajadi, Mohsen
062e2cdd-41d0-4cf5-b148-b7d7bb1bced4

Zhukov, Sergey S., Balos, Vasileios, Hoffman, Gabriela, Alom, Shamim, Belyanchikov, Mikhail, Nebioglu, Mehmet, Roh, Seulki, Pronin, Artem, Bacanu, George Razvan, Abramov, Pavel, Wolf, Martin, Dressel, Martin, Levitt, Malcolm H., Whitby, Richard J., Gorshunov, Boris and Sajadi, Mohsen (2020) Rotational coherence of encapsulated ortho and para water in fullerene-C60 revealed by time-domain terahertz spectroscopy. Scientific Reports, 10 (1), [18329]. (doi:10.1038/s41598-020-74972-3).

Record type: Article

Abstract

We resolve the real-time coherent rotational motion of isolated water molecules encapsulated in fullerene-C60 cages by time-domain terahertz (THz) spectroscopy. We employ single-cycle THz pulses to excite the low-frequency rotational motion of water and measure the subsequent coherent emission of electromagnetic waves by water molecules. At temperatures below ~100 K, C60 lattice vibrational damping is mitigated and the quantum dynamics of confined water are resolved with a markedly long rotational coherence, extended beyond 10 ps. The observed rotational transitions agree well with low-frequency rotational dynamics of single water molecules in the gas phase. However, some additional spectral features with their major contribution at ~2.26 THz are also observed which may indicate interaction between water rotation and the C60 lattice phonons. We also resolve the real-time change of the emission pattern of water after a sudden cooling to 4 K, signifying the conversion of ortho-water to para-water over the course of 10s hours. The observed long coherent rotational dynamics of isolated water molecules confined in C60 makes this system an attractive candidate for future quantum technology.

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Accepted/In Press date: 6 October 2020
e-pub ahead of print date: 27 October 2020
Published date: 6 November 2020

Identifiers

Local EPrints ID: 444871
URI: http://eprints.soton.ac.uk/id/eprint/444871
ISSN: 2045-2322
PURE UUID: cce556c1-8740-49b5-bbd0-4babe2acb399
ORCID for Malcolm H. Levitt: ORCID iD orcid.org/0000-0001-9878-1180
ORCID for Richard J. Whitby: ORCID iD orcid.org/0000-0002-9891-5502

Catalogue record

Date deposited: 09 Nov 2020 17:30
Last modified: 18 Feb 2021 16:56

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Contributors

Author: Sergey S. Zhukov
Author: Vasileios Balos
Author: Gabriela Hoffman
Author: Shamim Alom
Author: Mikhail Belyanchikov
Author: Mehmet Nebioglu
Author: Seulki Roh
Author: Artem Pronin
Author: George Razvan Bacanu
Author: Pavel Abramov
Author: Martin Wolf
Author: Martin Dressel
Author: Boris Gorshunov
Author: Mohsen Sajadi

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