Preparation of oriented and aligned H2 and HD by stimulated Raman pumping

Bartlett, Nate C. M.; Miller, Daniel J.; Zare, Richard N.; Sofikitis, Dimitris; Peter Rakitzis, T.; Alexander, Andrew J.

doi:doi:10.1063/1.2973628

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Neutral and charged excitations in carbon fullerenes from first-principles many-body theories

We investigate the accuracy of first-principles many-body theories at the nanoscale by comparing the low-energy excitations of the carbon fullerenes C20, C24, C50, C60, C70, and C80 with experiment. Properties are calculated via the GW–Bethe–Salpeter equation and diffusion quantum Monte Carlo methods. We critically compare these theories and assess their accuracy against available photoabsorption and photoelectron spectroscopy data. The first ionization potentials are consistently well reproduc...

High pressure study on molecular mobility of leucrose

Broadband dielectric measurements on leucrose were performed under ambient and high pressure. We showed that in this disaccharide, there are two secondary relaxation modes, a slower one sensitive to pressure and a faster one that is not. This finding clearly indicates that the faster secondary relaxation originates from the intramolecular motion. This conclusion contradicted previous interpretations of this mode observed for trehalose and maltitol, systems very closely related to leucrose. In a...

Stimulated Raman pumping has been used to prepare oriented and aligned samples of H₂(ν = 1,J = 1,2,3) and HD(ν = 1,J = 2) under collision-free conditions using the (1,0) S(0), S(1), Q(1), Q(2), and O(3) lines. The M-sublevel anisotropies were interrogated by polarized [2+1] resonance-enhanced multiphoton ionization via the (0,1) O(2), O(3), and S(1) lines of the E,F ¹Σ_g⁺−X ¹Σ_g⁺ system. The optical excitation schemes employed in this study generate highly oriented and aligned molecular ensembles. We show that the H₂(ν = 1,J = 2,M = 0) and H₂(ν = 1,J = 2,M = 2) samples retain their initial polarization for greater than 100 ns and are therefore suitable candidates for targets or projectiles in future scattering experiments.

Article Outline

INTRODUCTION
EXPERIMENTAL METHODS
RESULTS AND DISCUSSION
1. Orientation of H₂(ν = 1,J = 2)
2. Alignment of H₂(ν = 1,J = 2)
3. Orientation of H₂(ν = 1,J = 1,3)
CONCLUSIONS

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KEYWORDS and PACS

Keywords

deuterium, hydrogen neutral molecules, multiphoton processes, photoexcitation, photoionisation, Raman spectra

PACS

33.20.Fb

Raman and Rayleigh spectra (including optical scattering)
33.80.Rv

Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)
33.80.Eh

Autoionization, photoionization, and photodetachment

ARTICLE DATA

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http://dx.doi.org/10.1063/1.2973628

PUBLICATION DATA

ISSN

0021-9606 (print)

1089-7690 (online)

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American Institute of Physics

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