Maniraj M, D'Souza S W, Nayak J, Rai Abhishek, Singh Sanjay, Sekhar B N Raja, Barman S R
UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, 452001, Madhya Pradesh, India.
Rev Sci Instrum. 2011 Sep;82(9):093901. doi: 10.1063/1.3630948.
We report a bandpass ultraviolet photon detector for inverse photoemission spectroscopy with energy resolution of 82 ± 2 meV. The detector (Sr(0.7)Ca(0.3)F(2)/acetone) consists of Sr(0.7)Ca(0.3)F(2) entrance window with energy transmission cutoff of 9.85 eV and acetone as detection gas with 9.7 eV photoionization threshold. The response function of the detector, measured using synchrotron radiation, has a nearly Gaussian shape. The n = 1 image potential state of Cu(100) and the Fermi edge of silver have been measured to demonstrate the improvement in resolution compared to the CaF(2)/acetone detector. To show the advantage of improved resolution of the Sr(0.7)Ca(0.3)F(2)/acetone detector, the metal to semiconductor transition in Sn has been studied. The pseudogap in the semiconducting phase of Sn could be identified, which is not possible with the CaF(2)/acetone detector because of its worse resolution.
我们报道了一种用于逆光电发射光谱的带通紫外光子探测器，其能量分辨率为82±2毫电子伏特。该探测器（Sr(0.7)Ca(0.3)F(2)/丙酮）由能量传输截止为9.85电子伏特的Sr(0.7)Ca(0.3)F(2)入射窗和光电离阈值为9.7电子伏特的丙酮作为检测气体组成。使用同步辐射测量的探测器响应函数具有近似高斯形状。已经测量了Cu(100)的n = 1镜像势态和银的费米边缘，以证明与CaF(2)/丙酮探测器相比分辨率有所提高。为了展示Sr(0.7)Ca(0.3)F(2)/丙酮探测器分辨率提高的优势，对Sn中的金属-半导体转变进行了研究。可以识别出Sn半导体相中的赝能隙，而对于CaF(2)/丙酮探测器来说，由于其分辨率较差，这是不可能的。
