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Posts Tagged ‘NH4+’

NH4+ Ionization for Explosives and CWA Detection

Crucial application benefits from fast switching NH4+ ionization

The proprietary and IONICON exclusive method of producing NH4+ solely from H2O vapor and N2 in the established hollow cathode ion source, without the need of any ammonia (PCT application submitted) has many advantages.

Today we would like to introduce a promising application field where NH4+ is the ideal reagent ion. The unambiguous and highly sensitive detection of explosives as well as chemical warfare agents.

TATP real-time detection

Analyzing the headspace of some µg of the infamous explosive TATP with NH4+ reagent ions boosts the TATP.H+ signal by a factor of 20 compared to the H3O+ mode, because of suppressed fragmentation. Additionally the cluster TATP.NH4+ is formed at an even higher abundance. Thus, by using TATP.NH4+ as an additional detection marker, also the selectivity is considerably improved in “NH4+ mode”.

Live tests and real-time detection of CWAs

The nine most important CWAs (including Sarin, Tabun, Soman, VX, Lewisite, Cyclosarin, Nitrogen mustard and Sulfur mustard) have been investigated at a facility specialized and licensed for CWA handling.  (more…)

The New Exclusive SRI-MS Reagent Ion: NH4+ and Its Benefits

A novel proprietary method of NH4+ production for IONICON customers

In PTR-TOF-MS traditionally H3O+ reagent ions produced from H2O vapor are used. NH4+ reagent ions have been mentioned in literature as being particularly beneficial because of higher sensitivity (less fragmentation) and higher selectivity (higher proton affinity). However, so far toxic and corrosive ammonia was needed for NH4+ production.

We developed a novel method of producing NH4+ solely from H2O vapor and N2 (gas cylinder or filtered air) in the established hollow cathode ion source, without the need of any ammonia, by adjusting the pressure and electric fields in the source (PCT application submitted). That is, the reagent ions can be rapidly switched. (more…)