---
_id: '996'
abstract:
- lang: eng
  text: 'Iodine (I 2  ) molecules embedded in He nanodroplets are aligned by a 160
    ps long laser pulse. The highest degree of alignment, occurring at the peak of
    the pulse and quantified by ⟨cos 2 θ 2D ⟩ , is measured as a function of the laser
    intensity. The results are well described by ⟨cos 2 θ 2D ⟩  calculated for a gas
    of isolated molecules each with an effective rotational constant of 0.6 times
    the gas-phase value, and at a temperature of 0.4 K. Theoretical analysis using
    the angulon quasiparticle to describe rotating molecules in superfluid helium
    rationalizes why the alignment mechanism is similar to that of isolated molecules
    with an effective rotational constant. A major advantage of molecules in He droplets
    is that their 0.4 K temperature leads to stronger alignment than what can generally
    be achieved for gas phase molecules -- here demonstrated by a direct comparison
    of the droplet results to measurements on a ∼  1 K supersonic beam of isolated
    molecules. This point is further illustrated for more complex system by measurements
    on 1,4-diiodobenzene and 1,4-dibromobenzene. For all three molecular species studied
    the highest values of ⟨cos 2 θ 2D ⟩  achieved in He droplets exceed 0.96. '
article_number: '013946'
article_processing_charge: No
arxiv: 1
author:
- first_name: Benjamin
  full_name: Shepperson, Benjamin
  last_name: Shepperson
- first_name: Adam
  full_name: Chatterley, Adam
  last_name: Chatterley
- first_name: Anders
  full_name: Søndergaard, Anders
  last_name: Søndergaard
- first_name: Lars
  full_name: Christiansen, Lars
  last_name: Christiansen
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
- first_name: Henrik
  full_name: Stapelfeldt, Henrik
  last_name: Stapelfeldt
citation:
  ama: Shepperson B, Chatterley A, Søndergaard A, Christiansen L, Lemeshko M, Stapelfeldt
    H. Strongly aligned molecules inside helium droplets in the near-adiabatic regime.
    <i>The Journal of Chemical Physics</i>. 2017;147(1). doi:<a href="https://doi.org/10.1063/1.4983703">10.1063/1.4983703</a>
  apa: Shepperson, B., Chatterley, A., Søndergaard, A., Christiansen, L., Lemeshko,
    M., &#38; Stapelfeldt, H. (2017). Strongly aligned molecules inside helium droplets
    in the near-adiabatic regime. <i>The Journal of Chemical Physics</i>. AIP Publishing.
    <a href="https://doi.org/10.1063/1.4983703">https://doi.org/10.1063/1.4983703</a>
  chicago: Shepperson, Benjamin, Adam Chatterley, Anders Søndergaard, Lars Christiansen,
    Mikhail Lemeshko, and Henrik Stapelfeldt. “Strongly Aligned Molecules inside Helium
    Droplets in the Near-Adiabatic Regime.” <i>The Journal of Chemical Physics</i>.
    AIP Publishing, 2017. <a href="https://doi.org/10.1063/1.4983703">https://doi.org/10.1063/1.4983703</a>.
  ieee: B. Shepperson, A. Chatterley, A. Søndergaard, L. Christiansen, M. Lemeshko,
    and H. Stapelfeldt, “Strongly aligned molecules inside helium droplets in the
    near-adiabatic regime,” <i>The Journal of Chemical Physics</i>, vol. 147, no.
    1. AIP Publishing, 2017.
  ista: Shepperson B, Chatterley A, Søndergaard A, Christiansen L, Lemeshko M, Stapelfeldt
    H. 2017. Strongly aligned molecules inside helium droplets in the near-adiabatic
    regime. The Journal of Chemical Physics. 147(1), 013946.
  mla: Shepperson, Benjamin, et al. “Strongly Aligned Molecules inside Helium Droplets
    in the Near-Adiabatic Regime.” <i>The Journal of Chemical Physics</i>, vol. 147,
    no. 1, 013946, AIP Publishing, 2017, doi:<a href="https://doi.org/10.1063/1.4983703">10.1063/1.4983703</a>.
  short: B. Shepperson, A. Chatterley, A. Søndergaard, L. Christiansen, M. Lemeshko,
    H. Stapelfeldt, The Journal of Chemical Physics 147 (2017).
date_created: 2018-12-11T11:49:36Z
date_published: 2017-06-01T00:00:00Z
date_updated: 2025-06-04T08:17:46Z
day: '01'
department:
- _id: MiLe
doi: 10.1063/1.4983703
external_id:
  arxiv:
  - '1704.03684'
  isi:
  - '000405089400047'
intvolume: '       147'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1704.03684
month: '06'
oa: 1
oa_version: Submitted Version
publication: The Journal of Chemical Physics
publication_identifier:
  issn:
  - 0021-9606
publication_status: published
publisher: AIP Publishing
publist_id: '6403'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Strongly aligned molecules inside helium droplets in the near-adiabatic regime
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 147
year: '2017'
...