Tailor Made Monochromator
Books are analysis of metals, soil extracts, plant tissue ash, geochemical samples, air particulates, and foods, sampling approaches, and factors influencing precision and accuracy.
Continuing Series T A I L O R - M A D E M O N O C H R O M A T O R for your experimental requirements... a flexible 0.2m Vacuum Monochromator ' spectral scanning ol UV laser and fluorescence emission 1
dispersion ol synchrolron radiation
' absorption and emission spectroscopy ' calibration ol detectors and films < tunable UV radialion sources ' laboratory astrophysics ' plasma diagnostics • optics calibration • double beam applications
Vacuum UV UV-VIS IK
operation (from below 300A) Aberration -corrected concave holographic grating, kinematically mounted Fabricated housing UHV model available Fast optical system F / 4 . 5 nominal
Wavelength-optimized optics" Interchangeable diverter mirrors may be coated as individual reflective filters (e.g. for VUV-UV laser lines at 1460, 1720, 1930, 2484, 3080, or 3511A) for high peak efficiency and low out-ofband reflectance; kinematic mounts allow quick replacement without realignment. Standard broad-spectrum AI-MgF2 coatings allow efficient operation above 1150A, with 8 0 % typical reflectance at 1216A. Extreme UV coatings of Osmium are supplied for short-wavelength operation. Compatible ARC accessories: : ; Light Sources, I Power Supplies, i : Diffusion Pumping System, Γ Sample Chambers, IJ Detector Assemblies, OModel 50 Filter Assembly.
ACTON RESEARCH CORPORATION BOX215.S2SMAINSTHEET.ACTON. MASSACHUSETTS 01720 (61 !)263 3584.TEL Ε Χ 94-0787 ARC ACTO IN EUROPE, CONTACT ORIEL
PRECISION OPTICAL INSTRUMENTS COMPONENTS AND COATINGS
See Action Research Corp. at the Pittsburgh Conference, Booths 1 9 0 9 - 1 9 1 0 CIRCLE 6 O N READER SERVICE CARD
Encyclopedia of Electrochemistry of the Elements: Organic Section. Vol. 12. A. J. Bard and H. Lund, Eds. xii + 512 pages. Marcel Dekker, Inc., 270 Madison Ave., New York, N.Y. 10016. 1978. $88
Volume 12 continues the organic section which in four volumes will complete this long-standing series on electrochemistry of the elements. This book contains three review chapters: carbonyl compounds; carboxylic acids, esters, and anhydrides; and organic sulfur compounds. All chapters have sections on electrode potential, voltammetric properties, and electro chemical studies. The chapter on car boxylic acids, esters, and anhydrides includes a section on applied electro chemistry. Each section includes ta bles of available thermodynamic, ki netic, voltammetric, and other electro chemical data, and a critical discus sion on the known electrochemical re actions. Most of the references do not extend much beyond 1974. T h e book is reproduced from typewritten text.
U.S. Government Publications Order copies of the following PRE PAID at the price shown by SD Cat. No. from Superintendent of Docu ments, U.S. Government Printing Of fice, Washington, D.C. 20402. Foreign remittances must be in U.S. exchange and include an additional 25 % of the publication price to cover mailing costs
STAINLESS STEEL TWO STAGE REGULATOR MILLAFLOW D S G - 7 5 0 SERIES Corrosion
•
& Diffusion
Resistant
Pressure
Regulator
MILLAFLOW OFFERS THE FIRST TWO STAGE REGULA· TOR CONSTRUCTED FROM 316 STAINLESS STEEL, THIS SERIES OFFERS PRECISION REGULATION WITH LONG LIFE AND EXCELLED DEPENDABILITY. ^
MAXIMUM INLET PRESSURE: 2,200 psig.
g ^ ^ ^ g • O U T L E T PRESSURE RANGES: 1 15 psig, 2-75 psig and 5-150 psig. •
LEAKAGE RATE: LESS THAN 2 χ 1 0 ' 9 cc/sec HELIUM.
VERIFLO CORPORATION INSTRUMENT DIVISION · 250 Canal Blvd.. Richmond. CA 94804, (415) 235-9590
CIRCLE 2 2 0 O N
READER SERVICE CARD
270 A · ANALYTICAL CHEMISTRY, VOL. 5 1 , NO. 2, FEBRUARY
1979
Atomic Energy Levels—The RareEarth Elements. W. C. Martin, R. Zalubas, and L. Hagan. vii + 411 pages. 1978. $9.50. SD Cat. No. C 13.48:60
Energy level data are given for 66 atoms and atomic ions of the 15 ele ments lanthanum (Z = 57) through lutetium (Z = 71). Only experimentally determined energy levels are included; energies are restricted to excitations of outer-shell electrons and to inner-shell excitations up to the soft X-ray range. T h e levels are taken from analyses of the spectra of atomic gases wherever possible; however, the levels for sever al of the triply ionized rare earths are from analyses of the spectra of the
