| Autor: |
Tan YB; Raffles Institution, One Raffles Institution Lane, Singapore 575954, Singapore. tanyongboon1@gmail.com., Tay IR; Raffles Institution, One Raffles Institution Lane, Singapore 575954, Singapore. iantayrongde@gmail.com., Loy LY; NUS High School of Mathematics and Science, 20 Clementi Avenue 1, Singapore 129957, Singapore. h1410074@nushigh.edu.sg., Aw KF; NUS High School of Mathematics and Science, 20 Clementi Avenue 1, Singapore 129957, Singapore. h1410011@nushigh.edu.sg., Ong ZL; NUS High School of Mathematics and Science, 20 Clementi Avenue 1, Singapore 129957, Singapore. h1410087@nushigh.edu.sg., Manzhos S; Department of Mechanical Engineering, National University of Singapore, Block EA #07-08, 9 Engineering Drive 1, Singapore 117576, Singapore. mpemanzh@nus.edu.sg. |
| Abstrakt: |
We show that combining vibrational spectroscopy with signal processing can result in a scheme for ultrasensitive detection of molecules. We consider the vibrational spectrum as a signal on the energy axis and apply a matched filter on that axis. On the example of a nerve agent molecule, we show that this allows detection of a molecule by its vibrational spectrum, even when the recorded spectrum is completely buried in noise when conventional spectroscopic detection is impossible. Detection is predicted to be possible with signal-to-noise ratios in the recorded spectra as low as 0.1. We have studied the importance of the spectral range used for detection as well as of the quality of the computed spectrum used to program the filter, specifically, the role of anharmonicity, of the exchange correlation functional, and of the basis set. The use of the full spectral range rather than of a narrow spectral window with key vibrations is shown to be advantageous, as well as accounting for anharmonicity. |
