ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 07.65.-b  (1)
  • 31.30.Gs  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Frequency- and wavelength-modulation spectroscopies: Comparison of experimental methods using an AlGaAs diode laser (1993)
    Springer
    Applied physics 56 (1993), S. 118-122 
    Details
    ISSN: 1432-0649
    Keywords: 07.65.-b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low-wavelength modulation (1 kHz), high-wavelength modulation (100 MHz) and two-tone frequency modulation (390±5 MHz) spectroscopies are systematically compared by measuring the minimum detectable absorption achieved using an AlGaAs diode laser tuned on a third-overtone methane transition at 886 nm. From the S/N behavior has been extrapolated a minimum relative absorption (1 Hz of bandwidth) of 4.5(1)×10−7 for the LMW, 9.7(3)×10−8 for the HWM and 6.4(2)×10−8 for the TTFM. In the LWM case the detection-limit value is represented by the laser amplitude 1/f excess noise, while for the high-frequency detection techniques this contribution is negligible with respect to other noise sources. These detection limits well agree with the calculated “quantum limited” values based on measured laser power, modulation index, noise figure of the electronic components, and other parameters of the apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325250
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hyperfine structure of the 33 P state of3He and isotope shift for the 23 S-33 P 0 transition (1995)
    Springer
    The European physical journal 32 (1995), S. 285-293 
    Details
    ISSN: 1434-6079
    Keywords: 32.30.Jc ; 31.30.Gs ; 35.10.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of the3He 1s 3p 3 P state and the3He-4He isotope shift is determined by high precision measurements of the 1s2s 3 S 1-1s 3p 3 p 3 P J transition frequencies near 389 nm. A direct frequency measurement is made without the need for wavelength calibration by tuning a single laser to the atomic frequency, and using a novel heterodyne method to observe beat frequencies with a stable reference laser. A fit to a theoretical model of hyperfine structure is used to determine the hyperfine shifts. Additional off-diagonal mixing effects are investigated to resolve a possible systematic discrepancy in the hyperfine intervals. The final isotope shift without hyperfine structure of 42184308±165 kHz is used to deduce an rms nuclear charge radius for3He of 1.956±0.042 fm. This is in good agreement with other values obtained from atomic isotope shift measurements, and a recent theoretical value of 1.958±0.006 fm. The present result helps to resolve substantial differences in the3He nuclear radius derived from electron-nuclear scattering measurements, and it provides a significant test of the nuclear three-body problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437272
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...