Enter the new dimension of online mass spectrometry with IONICON PTR+SRI-MS featuring H3O+, NO+ and O2+ as precursor ions.
Quantify more volatile compounds than ever in real-time with PTR+SRI-MS and take advantage of single-digit pptv-level detection limits, only available with IONICON PTR-MS.
Order your new IONICON PTR-MS with SRI (switchable reagent ions) capabilities or consult with us concerning upgrade capabilities of your instrument.
Advantages of using H3O+, NO+ and O2+ as precursor ions
H3O+ is ideal for many applications as our customers have proven for more than a decade. In some cases however it can be useful to use more than one reagent ion in your PTR-MS.
By using PTR+SRI-MS isomeric VOC compounds can be separated and instantaneously quantified (the differentiation of isobaric compounds is already possible by using IONICON PTR-TOF-MS).
NO+ is like H3O+ a soft ionizer, ionization occurs mainly through charge transfer, whereas O2+ is found to be a less soft chemical ionization agent and can be used where proton transfer from H3O+ does not work. Therefore more VOCs than ever can be quantified in real-time with PTR+SRI-MS.
Market-leading detection limit also with PTR+SRI-MS
We have developed a PTR+SRI-MS where the chemical reagent ions NO+ and O2+ are generated in our ion source at intensities matching or in case of NO+ even surpassing those of traditional IONICON PTR-MS H3O+ ions by up to 40%, thus enabling ultra-high sensitivity and ultra-low detection limits also for this new dimension of PTR-MS technology.
This overcomes one of the biggest down-sides of competing technologies like SIFT-MS, where mass pre-selection of ions is employed and a carrier gas dilutes the sample, at the expense of some two orders of magnitude lower detection sensitivity for VOCs.
The PTR+SRI-MS products
H3O+,NO+ and O2+ as precursor ion package is available as an option for the following IONICON products: