Non-proximate, Hand-Held Probe with Positional Feedback for Real-Time Analysis of Three-Dimensional Object Surfaces

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Non-proximate mass spectrometry techniques often suffer from analyte loss and signal carryover.
• Existing methods utilize unheated plastic tubing, leading to inefficiencies in sampling organic analytes from distant surfaces.

Purpose of the Study:

• To develop a flexible and efficient transfer system for non-proximate desorption photoionization (NPDPI).
• To enable real-time analysis of analytes from complex and inaccessible surface geometries.

Main Methods:

• A novel gooseneck transfer tubing design was implemented, offering flexibility and reduced analyte adsorption.
• An integrated desorption probe with a heated gas jet and contact sensors was developed for user-friendly operation.
• Neutrally desorbed analytes were transferred up to 4 meters to a doped photoionization source.

Main Results:

• The new gooseneck tubing significantly reduced organic molecule loss compared to traditional plastic tubing.
• Real-time analysis was successfully demonstrated on surfaces with narrow dimensions and blind concave geometries.
• Both volatile and involatile analytes were detected from various commonplace objects.

Conclusions:

• The flexible gooseneck NPDPI system overcomes limitations of previous non-proximate sampling techniques.
• This advancement allows for efficient and clean analysis of challenging sample surfaces.
• The technology holds promise for expanded applications in trace analyte detection and surface characterization.