The Amsterdam Piezo Valve is able to produce very cold seeded molecular beams. The rotational temperature of polyatomic molecules seeded in Neon at moderate backing pressures of about 4-7 Bar is typically around 1-1.5 Kelvin. See below a hexapole focusing spectrum of a pulsed molecular beam of CH3Br with either the Amsterdam Piezo Valve or the General Valve (magnetic plunger type). | Pulse width The Amsterdam Piezo Valve is able to produce short and intense pulses of gas. Depending on the carrier gas pulses with a FWHM of 10-20 microsec can be obtained. Below a graph is shown detecting NO+ ions after ionization with a nanosecond laser of two different skimmed and seeded beams of 0.1% NO in helium and neon. The delay between the laser firing and the valve trigger was scanned. |
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