期刊
ANALYTICAL CHEMISTRY
卷 80, 期 17, 页码 6537-6544出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac8005044
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资金
- GEBERT RUF STIFTUNG [P-085/03]
An instrument that combines near-field laser ablation at atmospheric pressure with an ion trap/time-of-flight mass spectrometer was developed. By coupling a UV laser into a fiber tip of a scanning near-field optical microscope, ablation craters much smaller than achievable with conventional laser optics can in principle be obtained. Laser ablation was performed on samples such as DHB, anthracene, and pyrene. Desorbed neutral analytes are transferred from atmospheric pressure to an ion trap, ionized, and stored. After 10 ms, the ions are extracted into a sensitive time-of-flight spectrometer. We demonstrate the feasibility of this unique SNOM-MS instrument for chemical analysis with unprecedented lateral resolution at atmospheric pressure. Spatially resolved molecular analysis with a lateral resolution of 5 mu m (fwhm) and a sensitivity of similar to 60 fmol of solid andiracene is demonstrated, along with topographical analysis with the same instrument. No other technique available today offers this lateral resolution in combination with soft mass spectrometry and the capability of sampling fragile specimens at atmospheric pressure.
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