- 作者: 李遠鵬 ; 葉佩勳 ; 呂建豪 等
- 作者服務機構: 清華大學化學系
- 中文摘要: Time-resolved Fourier-transform spectroscopy and two- color laser-induced grating spectroscopy are two new techniques recently employed in this laboratory. We recorded emission in the near infrared region during laser photolysis of HONO/sub 2/ with a step-scan Fourier-transform spectrometer and achieved temporal resolution in the microsecond range and spectral resolution of 0.1/cm. Rotationally resolved emission lines of the (0,0) band of the D/sup 2/.SIGMA./sup +/.arrr.A/sup 2/.SIGMA./sup +/ transition of NO in the region 8900-9300/cm with irregular relative intensities were observed when an ArF excimer laser was used to photodissociate HONO/sub 2/. The spectroscopic parameters of both D/sup 2/.SIGMA./sup +/ and A/sup 2/.SIGMA./sup +/ states agree with those previously reported. When a narrow-band ArF laser was used, selective rotational levels of the D state of NO were populated depending on the wavelength of the ArF laser. Our results indicate that absorption of a 193nm photon by NO (.upsilon."=1) is responsible for the observed emission. To test the technique of two-color laser-induced grating spectroscopy, we employed the B/sup 3/II/sub ou//sup +/-X/sup 1/.SIGMA./sub g//sup +/ system of I/sub 2/. Background-free spectra with transitions involving rotationally selected states were recorded. Various experimental schemes were employed with population gratings formed in either the B or X state. Signals due to different four-wave mixing schemes were distinguished by variation of relative timing between the grating beams and the probe beam.
- 英文摘要: --
- 中文關鍵字: Time-Resolved Fourier Transfer Spectroscopy; Two-Color Laser- Induced Grating Spectroscopy; Photolysis; Excimer; Transition State
- 英文關鍵字: 時間解析傅立葉轉換光譜術;雙色雷射誘導光柵光譜術;光解;激態單體;過渡狀態