RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

Nov 2009

Volume 80, Issue 11, Articles (11xxxx)

Issue Cover Spotlight Figure

Rev. Sci. Instrum. 80, 111101 (2009); http://dx.doi.org/10.1063/1.3224703 (17 pages)

R. Vijay, M. H. Devoret, and I. Siddiqi

Poincaré sections of an RF-driven Josephson junction oscillator. Right: Oscillator biased near the upper bifurcation point (IRF=IB+) where two attractors OL and OH coexist. The transition from OL to OH forms the basis of a sensitive threshold amplifier. Left: Oscillator biased outside the bistable region where a single attractor exists.

Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Measurements of total peroxy and alkyl nitrate abundances in laboratory-generated gas samples by thermal dissociation cavity ring-down spectroscopy

Dipayan Paul, Amanda Furgeson, and Hans D. Osthoff

Rev. Sci. Instrum. 80, 114101 (2009); http://dx.doi.org/10.1063/1.3258204 (8 pages) | Cited 5 times

Online Publication Date: 9 November 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A novel measurement technique, thermal dissociation cavity ring-down spectroscopy (TD-CRDS), for rapid (1 s time resolution) and sensitive (precision ∼ 100 parts per trillion by volume (10−12; pptv)) quantification of total peroxy nitrate (ΣPN) and total alkyl nitrate (ΣAN) abundances in laboratory-generated gas mixtures is described. The organic nitrates are dissociated in a heated inlet to produce NO2, whose concentration is monitored by pulsed-laser CRDS at 532 nm. Mixing ratios are determined by difference relative to a cold inlet reference channel. Conversion of laboratory-generated mixtures of AN in zero air (at an inlet temperature of 450 °C) is quantitative over a wide range of mixing ratios (0–100 parts per billion by volume (10−9, ppbv)), as judged from simultaneous measurements of NOy using a commercial NO–O3 chemiluminescence monitor. Conversion of PN is quantitative up to about 4 ppbv (at an inlet temperature of 250 °C); at higher concentrations, the measurements are affected by recombination reactions of the dissociation products. The results imply that TD-CRDS can be used as a generic detector of dilute mixtures of organic nitrates in air at near-ambient concentration levels in laboratory experiments. Potential applications of the TD-CRDS technique in the laboratory are discussed.
Show PACS
93.85.-q Instruments and techniques for geophysical research: Exploration geophysics
92.60.hf Tropospheric composition and chemistry, constituent transport and chemistry
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close