Accession Number : ADA538723


Title :   Investigation of Anti-Relaxation Coatings for Alkali-Metal Vapor Cells using Surface Science Techniques


Descriptive Note : Journal article


Corporate Author : CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB


Personal Author(s) : Seltzer, S J ; Michalak, D J ; Donaldson, M H ; Balabas, M V ; Barber, S K ; Bernasek, S L ; Bouchiat, M A ; Hexemer, A ; Hibberd, A M ; Kimball, D F ; Jaye, C ; Karaulanov, T ; Narducci, F A ; Rangwala, S A ; Robinson, H G ; Shmakov, A K ; Voronov, D L ; Yashchuk, V V ; Pines, A ; Budker, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a538723.pdf


Report Date : 01 Feb 2011


Pagination or Media Count : 15


Abstract : Many technologies based on cells containing alkali-metal atomic vapor benefit from the use of anti-relaxation surface coatings in order to preserve atomic spin polarization. In particular, paraffin has been used for this purpose for several decades and has been demonstrated to allow an atom to experience up to 10,000 collisions with the walls of its container without depolarizing, but the details of its operation remain poorly understood. We apply modern surface and bulk techniques to the study of paraffin coatings, in order to characterize the properties that enable the effective preservation of alkali spin polarization. These methods include Fourier transform infrared spectroscopy, differential scanning calorimetry, atomic force microscopy, near-edge X-ray absorption fine structure spectroscopy, and X-ray photoelectron spectroscopy. We also compare the light-induced atomic desorption yields of several different paraffin materials. Experimental results include the determination that crystallinity of the coating material is unnecessary, and the detection of C=C double bonds present within a particular class of effective paraffin coatings. Further study should lead to the development of more robust paraffin anti-relaxation coatings, as well as the design and synthesis of new classes of coating materials.


Descriptors :   *SURFACE CHEMISTRY , *ALKALI METAL COMPOUNDS , *SPIN STATES , *POLARIZATION , SURFACE PROPERTIES , X RAY PHOTOELECTRON SPECTROSCOPY , DIFFERENTIAL SCANNING CALORIMETRY , ATOMIC PROPERTIES , FOURIER TRANSFORMATION , COATINGS , INFRARED SPECTROSCOPY , METAL VAPORS , BOSE EINSTEIN CONDENSATES


Subject Categories : Physical Chemistry
      Coatings, Colorants and Finishes
      Properties of Metals and Alloys
      Atomic and Molecular Physics and Spectroscopy
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE