Ion Attachment Mass Spectrometer Temperature Control
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Solution Overview
Problem
Ionization efficiency and condensation/adsorption issues in ion attachment mass spectrometry, particularly when the ion generation source is warmed to 150° C. to 200° C., leading to decreased sensitivity and contamination.
Innovation Solution
A mass spectrometer system with a control unit that adjusts the temperature of the ion attachment region to exclude the range of 150° C. to 200° C., by plotting attachment energy along the abscissa and temperature along the ordinate, ensuring the temperature falls within a specific range to optimize ionization efficiency and prevent condensation/adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the ion generation source is warmed to 150°C to 200°C, then condensation/adsorption is reduced, but ionization efficiency decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the temperature of the ion generation source based on the attachment energy of the analyte. Instead of using a fixed temperature range (150-200°C), the system calculates an optimal temperature using the formula T = 150 × E (where E is attachment energy in eV) and operates within a dynamic range around this calculated value. This resolves the contradiction by adapting the temperature parameter to each specific analyte's properties, preventing condensation/adsorption while maintaining high ionization efficiency.
2Object-generated harmful factors
If the ion generation source temperature is increased, then contamination is minimized, but sensitivity decreases
Solution Approach 1:
The patent resolves this contradiction by changing the temperature parameter dynamically based on attachment energy. The system calculates optimal temperature as T = 150 × E and operates within a range of ±50°C around this value, rather than using the conventional fixed 150-200°C range. This adaptive approach minimizes contamination by maintaining sufficiently high temperatures while preserving sensitivity by avoiding excessive heating that would reduce ionization efficiency.
3Ease of operation
If a fixed temperature range of 150°C to 200°C is used, then operation is simplified, but applicability to different substances is limited
Solution Approach 1:
The patent transforms the fixed temperature approach into a dynamic parameter change system. The control unit calculates optimal temperature for each analyte using the formula T = 150 × E (where E is attachment energy in eV) and operates within a dynamic range from (100 × E - 50) to (200 × E). This maintains ease of operation through automated calculation and control while dramatically improving versatility by adapting to different attachment energies of various substances.
Solution Approach 2:
The system applies self-service by automatically calculating and adjusting the optimal temperature based on the analyte's attachment energy without requiring manual intervention. The control unit performs the calculation T = 150 × E and sets the temperature range automatically, making the system adaptable to different substances while maintaining simple operation. The system serves itself by using the analyte's intrinsic property (attachment energy) to determine the operating parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances ionization efficiency and prevents condensation/adsorption, allowing for quick and simple measurement of a wider range of substances without the need for pre-separation, maintaining high sensitivity and minimizing contamination.
Implementation Method 1
When heated to about 600° C. to 800° C. in a low pressure atmosphere, the emitter 120 generates, from its surface, positively charged alkali metal ions (metal ions) such as Li+
Implementation Method 2
a gas such as N2 is introduced into the ion generation source 100 at a pressure of about 50 to 100 Pa (at a flow rate of 5 to 10 sccm) to cause the ion-attached molecules to often collide with the gas molecules. At this time, the extra energy held by the ion-attached molecules moves to the other gas molecules, and the ion-attached molecules stabilize.
Data Source
AI summary
A mass spectrometer system comprises a chamber having an ion emitting unit to emit metal ions in the chamber with a communicating hole; a neutral molecule introduction unit; another gas introduction unit; a controller controlling a temperature of a region where metal ions attach to the neutral molecules; and a mass analyzer for the neutral molecules with the metal ions, wherein plotting an attachment energy of the metal ions attached to the neutral molecules in the chamber along an abscissa and the temperature of the region where the metal ions attach to the neutral molecules along an ordinate, the controller adjusts the temperature of the region so as to fall within a range obtained by excluding a range corresponding to the temperature of the region from 150 to 200° C. from a range surrounded by the temperatures of the region [° C.]=150×attachment energy [eV], 100×attachment energy [eV]−50, and 20° C., and attachment energies [eV]=2.1 and 0.5.