Hexapole transport and focusing of vibrationally excited NO molecules prepared by optical pumping

Chen, Jun; Matsiev, Daniel; White, J. A.; Murphy, Michael; Wodtke, Alec M.

doi:10.1016/j.chemphys.2004.01.025

Cited by 21 publications

(18 citation statements)

References 37 publications

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“…Although not used in the current work, the hexapole can be used to enhance the number of vibrationally excited molecules in Region 3 by molecular focusing. Further details can be found in Chen et al 16 Once passing through the second chamber, the molecules enter the surface chamber, Region 3, through a 1-mm-diam aperture.…”

Section: Methodsmentioning

confidence: 99%

Vibrationally promoted emission of electrons from low work function surfaces: Oxygen and Cs surface coverage dependence

White

Matsiev

Auerbach

et al. 2005

Journal of Vacuum Science & Technology A: Vacuum, Surfaces,

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Section: Methodsmentioning

confidence: 99%

Vibrationally promoted emission of electrons from low work function surfaces: Oxygen and Cs surface coverage dependence

White

Matsiev

Auerbach

et al. 2005

Journal of Vacuum Science & Technology A: Vacuum, Surfaces,

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“…The experiments are carried out in a molecular beam apparatus similar to that described in previous papers [39,40]. A pulsed supersonic molecular beam of rotationally cold NO molecules (T ROT $ 6K) is produced by expanding either a 60% NO/Kr (KE = 0.035 eV) or a 1% NO in H 2 (KE = 1.0 eV) mixture into the vacuum through a piezoelectric valve (1 mm u nozzle, 10 Hz, 3 Atm.…”

Section: Methodsmentioning

confidence: 99%

Orienting polar molecules without hexapoles: Optical state selection with adiabatic orientation

Schäfer

Bartels

Hocke

et al. 2012

Chemical Physics Letters

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A pedagogic review of technology used to orient polar molecules is presented to place in context the report of a new approach to this problem. Laboratory frame orientation of polar molecules is achieved by state-specific optical pumping in a region free of electric fields followed by adiabatic transport into a static electric field. This approach overcomes some of the limitations of the more common hexapole focusing method. In particular the method is nearly insensitive to the kinetic energy of the sample. We demonstrate production of oriented samples of NO (l el = 0.15 D) with translational energies above 1 eV in both high-and low-field seeking states. The method can be extended to many other classes of molecules, including near symmetric tops and ions.

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“…The electronic landscape for preparation of NO in various vibrational states is the same as shown by Chen et al 24 Here, we describe the procedure to prepare vЉ = 18 using SEP, but the method was similar for 4 ഛ v ഛ 18. The pump laser excited NO molecules via the A 2 ⌺ + ͑v =3͒ ← X 2 ⌸ 1/2 ͑v =0͒ transition at ϳ195.5 nm, where the light was generated by sum-frequency mixing in the following manner.…”

Section: Stimulated Emission Pumpingmentioning

confidence: 99%

Vibrationally promoted electron emission from low work-function metal surfaces

White

Chen

Matsiev

et al. 2006

The Journal of Chemical Physics

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We observe electron emission when vibrationally excited NO molecules with vibrational state v, in the range of 9 < or = v < or =18, are scattered from a Cs-dosed Au surface. The quantum efficiency increases strongly with v, increasing up to 10(-2) electrons per NO (v) collision, a value several orders of magnitude larger than that observed in experiments with similar molecules in the ground vibrational state. The electron emission signal, as a function of v, has a threshold where the vibrational excitation energy slightly exceeds the surface work function. This threshold behavior strongly suggests that we are observing the direct conversion of NO vibrational energy into electron kinetic energy. Several potential mechanisms for the observed electron emission are explored, including (1) vibrational autodetachment, (2) an Auger-type two-electron process, and (3) vibrationally promoted dissociation. The results of this work provide direct evidence for nonadiabatic energy-transfer events associated with large amplitude vibrational motion at metal surfaces.

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Hexapole transport and focusing of vibrationally excited NO molecules prepared by optical pumping

Cited by 21 publications

References 37 publications

Vibrationally promoted emission of electrons from low work function surfaces: Oxygen and Cs surface coverage dependence

Vibrationally promoted emission of electrons from low work function surfaces: Oxygen and Cs surface coverage dependence

Orienting polar molecules without hexapoles: Optical state selection with adiabatic orientation

Vibrationally promoted electron emission from low work-function metal surfaces

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