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Absorption Line Spectroscopy in Practice, Slides of Chemistry

University of Notre DameChemistry

Department of Astronomy & Columbia Astrophysics Lab. Columbia University ortunity. Absorption Line Spectroscopy in Practice.

Typology: Slides

2022/2023

Uploaded on 05/11/2023

freddye
freddye 🇺🇸

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Frits Paerels
with Richard Nederlander, Joheen Chakraborty, Margo Collins,
John Staunton, Kyle Neary, Kate Steiner, Tanisha Jhaveri,
Hunter Holland, Kate Miller, Susannah Abrams, Tze Goh,
Bhairavi Chandersekhar,
Aswath Suryanarayanan, Johon Milla, and Navin Sridhar
Department of Astronomy & Columbia Astrophysics Lab
Columbia University
in astrophysics: nuisance and opportunity
Absorption Line Spectroscopy in Practice
AtomDB Spectroscopy Workshop and School
August 3-5, 2020
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Download Absorption Line Spectroscopy in Practice and more Slides Chemistry in PDF only on Docsity!

Frits Paerels

with Richard Nederlander, Joheen Chakraborty, Margo Collins,

John Staunton, Kyle Neary, Kate Steiner, Tanisha Jhaveri,

Hunter Holland, Kate Miller, Susannah Abrams, Tze Goh,

Bhairavi Chandersekhar,

Aswath Suryanarayanan, Johon Milla, and Navin Sridhar

Department of Astronomy & Columbia Astrophysics Lab

Columbia University

Absorption Line Spectroscopy in Practice

AtomDB Spectroscopy Workshop and School

August 3-5, 2020

many open ISM questions- for instance: what form is most of the interstellar carbon? graphite? graphene? polycyclic molecules? X-ray spectroscopy can tell us: absorption spectroscopy of the interstellar medium around the carbon-K edge (280 eV), using the LETGS on the Chandra X-ray Observatory (with John Staunton)

  1. Funny Line Shape: Neutral Carbon in the ISM

Transmission Spectrum

  1. 26 0. 28 0. 30 0. 32 0. 34 Energy [keV]

Ratio 1ES1553+113 LETGS/ 500 ksec instrument C 1s-2π* C 1s-2σ* C II 1s-2p ?? a ‘ red shoulder ’

J. D. Jackson: Classical Electrodynamics real and imaginary parts of the polarizability of the harmonic oscillator: imaginary part: absorption , real part: scattering frequency polarizability real part imaginary part wide narrow

the real polarizability of graphite (Draine 2016) real (scattering) imaginary (absorption) also: the scattering is orientation and polarization dependent ĉ

Transmission Spectrum

  1. 26 0. 28 0. 30 0. 32 0. 34 Energy [keV]

Ratio fit scattering by 0.1-0.2μm graphite spheres, random orientation, no polarization; C mass column fixed ? possibly indicative of polarization and/or alignmnent?

Transmission Spectrum

  1. 26 0. 28 0. 30 0. 32 0. 34 Energy [keV]

Ratio

(and in fact the spectrum is variable) December 6, 2013 November 9, 2013

pulling the spectrum apart: evidence for circumstellar absorption (huge Doppler blueshift) C VI Lyman spectrum

n=1-

n=1-

n=1-

n=1-

n=1-

n=1- n=1- n=1- n=1- n=1- n=1-3, m= v ≈ -1300 km/s C VI

N VI n=1- n=1- n=1- n=1- n=1- n=1-3, m= same velocity offset in N VI (and C V)

statements of general validity, and possibly of educational value

  1. Basic physics is fun and pops up everywhere
  2. Be prepared to ignore confusing evidence if you can identify a rational basis for doing so

and an encore: Chandra HETGS Cygnus X-3 m= (with Aswath Suryanarayanan) a P Cyg profile on the He-like Fe resonance line