U.S. Environmental Protection Agency, 26 W. Martin Luther King Dr., Cincinnati, OH 45268

66 -- JET REMPI SYSTEM SOL PR-CI-00-10056 DUE 113099 POC Hans Schellhas (513) 487-2055 E-MAIL: Cincinnati Contracts Management Division, schellhas.hans@epamail.epa.gov. The U.S. EPA intends to negotiate on a sole source basis, under authority of FAR 6.302, with SRI, International, for the acquisition of a two-color, Jet REMPI/TOFMS system, capable of analyzing for trace aromatic and halogenated aromatic molecules in combustion flue gas systems. This system shall be comprised of the following major components: a Time-of-Flight mass spectrometer (TOFMS) with ion source assembly, reflector assembly, 40 mm MCP detector, offset adapter, flight tube, reflector assembly, power supply; a Continuum Nd:YAG-pump laser with 2nd/3rd harmonic generators, injection seeder and 3rd harmonic output; a Continuum optical parametric oscillator (OPO) with frequency doubler and optical components, a 400 mHz computer with digitizer; a system frame; a pulsed gas valve, controller, and heater system; a Varian vacuum pump with 250L/s split-flow turbomolecular pump and controller, a 550 L/s turbomolecular pump and controller, and a 17 cfm mechanical pump; and all associated systems to operate the instrument. EPA's required system must be able to measure flue gas concentrations of multiple, prespecified, halogenated, one or more ring, aromatic isomers or even isotopomers of compounds such as chlorinated dioxins and furans from unambiguous spectra in a short time frame (5-30s per compound) with rapid switching between target compounds using a two dimensional, wavelength and mass spectra scheme to provide a system capable of real time analysis of concentrations of target compounds. This system must have 1) a jet valve inlet system for rapid cooling of the target sample to < 5 K, 2) it must be capable of two-color REMPI over a UV range of 220-400 nm with a laser repetition rate to 10 Hz., 3) it must include the ability to rapidly (<60 s) switch between the detection of multiple compounds without operator intervention or adjustment, 4) it must be coupled via ion extraction optics to a 500 amu-capable time of flight mass spectrometer, and 5) it must have been tested, demonstrated, and calibrated using multiple, highly chlorinated dioxin and furan congeners. The system must have detection limits for benzene of at least 20 pptv based on an ionization volume of 10 mm3, a signal-to-noise ratio of 1:1, and an acquisition time of 10 seconds. It must have a response/recycle time, or the time required to switch target compounds with no optical component changes, of less than 60 seconds. The system must maintain concentration linearity for benzene of at least three orders of magnitude. It must have an accuracy of laser intensity of +/- 15% and wavelength setting of 0.001 nm such that, with averaging, total accuracy of less that +/- 10%. It must consist of a a continuously tunable system with ultraviolet range of the instrument at least 220 -- 400 nm. THIS IS NOT A REQUEST FOR PROPOSALS. Only sources capable of fully meeting the unique technical performance capabilities outlined above, without exception will be considered. Those wishing to be considered must be submit complete technical documentation to the office identified above. Documentation must be submitted within 15 days of the publication of this notice. The point of contact is Hans Schellhas. The subject facsimile number is (513) 487-2109. Posted 11/15/99 (W-SN400733). (0319)

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