This instrument, constructed by JAFCI for the Wenthold group, has no commercially available equivalent.  The NIPES (Negative Ion PhotoElectron Spectrometer) combines a pulsed ion source, a time-of-flight mass spectrometer, a frequency-multiplied YAG laser, and a time-of-flight electron energy analyzer.  In operation, ions are generated in the source and separated in the mass spectrometer; a chosen mass packet is irradiated with a laser pulse to detach electrons that are energy analyzed.  The difference between the photon energy and the kinetic energy of the electron yields the electron affinity of the ion.  Most of the electronics and hardware in the system were custom fabricated by JAFCI.

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NIPES

NIPES - (Partial View)

NIPES (Partial View)

Particle Excellator Assembly

Negative Ion PhotoElectron Spectrometer

Negative Ion PhotoElectron Spectrometer

Negative Ion PhotoElectron Spectrometer

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NIPES

Negative Ion PhotoElectron Spectrometer