全部

• 2018-12-12 04:32發(fā)布了問答

  紫外可見吸收光譜的性質(zhì)

  　

  532人看過

• 2018-12-10 15:12發(fā)布了問答

  怎么計(jì)算光纖傳感中自由光譜范圍fsr

  　

  370人看過

• 2018-12-06 19:16發(fā)布了問答

  跪求英語翻譯。

  Experiment SiO2 films with a thickness of 300 nm were grown on (100) p-Si substrates， with a resistivity of 4 W cm， using thermal oxidation at 1，000 C， for 90 min. Monte Carlo simulationcode (TRIM) was used to calculate the adequate ene... Experiment SiO2 films with a thickness of 300 nm were grown on (100) p-Si substrates， with a resistivity of 4 W cm， using thermal oxidation at 1，000 C， for 90 min. Monte Carlo simulationcode (TRIM) was used to calculate the adequate energy in order to place the maximum Ge concentration at the middle of the SiO2 film. SiO2 matrices were implanted with Ge74+ ions at RT， with 250 keV energy， using implantation doses of [0.5， 0.8， 1， 2， 3 and 4] · 1016 cm–2. After ion implantation， the samples were annealed at 1，000 C for 1 h in a forming gas atmosphere to precipitate Ge and to form the nanocrystallites. Raman spectra were obtained using a triple grating T- 64000 Jobin-Yvon spectrometer， with 1 cm–1 spectral resolution. The 514 nm line of the argon laser was used to excite the samples. All samples were measured at RT; the laser power on the sample was 9 mW. The diameter of the laser spot was 50 lm and the integration time was 30 min. The resonant Raman spectra were obtained in the backscattering configuration. The orientation of the Si substrate is fundamental to polarize the laser light， allowing the second-order Raman Si peak， at about 300 cm–1， to be suppressed not masking the Raman peaks corresponding to Ge-nc. PL spectra were measured at RT with a 240 nm excitation source， using a Spex Fluoromax spectrometer with a R298 Hamamatsu photomultiplier. Compositional analysis of the SiO2 matrix was carried out using a DIGILAB infra-red Fourier transform spectrometer. The system was purged with dry N2 to reduce the infrared (IR) absorption from H2O and CO2. Transmittance measurements were carried out within the 400– 4，000 cm–1 range at 300 K. The beam spot size was about 5 mm diameter and the resolution was 4 cm–1. In all cases a non-processed Si substrate sample was used as a reference. Results and discussions Figure 1 presents the Raman spectra of the films implanted with various doses [0.5; 0.8; 1; 2; 3; 4] · 1016 cm–2， followed by annealing forming-gas， (92% N2 + 8% H2) at 1，000 C， for 1 h. The position of the peak for bulk Ge was determined at 302.4 cm–1 and this value is used to compare with Ge-nc peaks. The Raman spectra of the implanted samples clearly show three bands: 210–280， 304 and 430 cm–1. The first one， 210–280 cm–1， is associated with amorphous Ge compounds. Such band was expected as the samples have been annealed at 1，000 C， therefore above the Ge melting temperature (938.3 C) [10]. At this temperature， Ge precipitates as liquid droplets inside a viscous oxide matrix. The second band was near 304 cm–1， and can be associated with Ge-nc. This band is in good agreement with the work reported by Wu et al. [11]. Finally， the third band at 430 cm–1 is related to local Si–Si vibrations [12]. 展開

  390人看過

• 2018-01-22 20:12發(fā)布了問答

  可以做ROHS分析的手持式光譜儀有些那些型號？

  可以做ROHS分析的手持式光譜儀有些那些型號？

  400人看過

• 2017-07-19 23:39發(fā)布了問答

  中階梯光柵光譜儀和中階梯光柵ICP光譜儀是一種光譜儀嗎

  　

  586人看過

• 2017-07-09 17:05發(fā)布了問答

  我測試是高嶺土中的鉀鈉含量。用的是型號FP6410火焰光度計(jì)。 測試得到

  我測試是高嶺土中的鉀鈉含量。用的是型號FP6410火焰光度計(jì)。 測試得到讀數(shù)是鉀鈉濃度值。而我想要是鉀鈉的百分比含量。 我不知道測試結(jié)果是怎么處理，我試過用濃度計(jì)算出質(zhì)量再得出百分含量但是很復(fù)雜也行不通。。那會(huì)用到曲線來計(jì)算結(jié)果嗎？

  541人看過

• 2017-06-07 16:50發(fā)布了問答

  紫外光譜吸收強(qiáng)度的主要影響因素有哪些

  　

  776人看過

• 2016-11-30 00:27發(fā)布了問答

  請問普通的電子照度儀為什么不可以測定單一紫外波長的光強(qiáng)度？

  請問這樣類型的照度儀可不可以測定可見光單一波長的光的光強(qiáng)度？可不可以測定紫外光單一波長的光的光強(qiáng)度？... 請問這樣類型的照度儀可不可以測定可見光單一波長的光的光強(qiáng)度？可不可以測定紫外光單一波長的光的光強(qiáng)度？ 展開

  508人看過

• 2016-10-06 07:51發(fā)布了問答

  請問怎么將FTIR紅外光譜的照片變成電子版數(shù)據(jù)？

  因?yàn)橐黄鹗?995年太舊了，沒有U盤可以插。。只有照片一張

  552人看過

• 2016-02-21 02:55發(fā)布了問答

  掃描儀是基于什么原理

  　

  891人看過

• 2015-08-08 22:46發(fā)布了問答

  進(jìn)口的光譜儀有哪些的品牌？

  1068人看過

• 2012-11-13 08:15發(fā)布了問答

  拉曼圖譜的原理

  　

  500人看過

• 2012-06-06 15:53發(fā)布了問答

  華東理工大學(xué)考研考的電路分析是那本書？

  　

  324人看過

• 2012-04-19 05:11發(fā)布了問答

  原子吸收光譜、分光光度計(jì)、紫外光譜、質(zhì)譜儀、紅外分別測量什么的？

  　

  650人看過

• 2012-04-01 09:28發(fā)布了問答

  任E行行車記錄儀畫面卡怎么回事 畫面連續(xù)停頓

  　

  417人看過

• 2012-03-13 21:12發(fā)布了問答

  紅外光譜儀適用的波數(shù)范圍是多少?

  　

  505人看過

加載更多