---
title: "HFS – Hydrogen Forward Scattering Spectrometry"
url: "https://mat-cs.com/hydrogen-forward-scattering-spectrometry-hfs/"
description: "Hydrogen Forward Scattering Spectrometry (HFS) is an ion scattering technique that is used to quantitatively determine the vertical distribution of hydrogen in thin films."
---

Surface & Thin Film

# HFS – Hydrogen Forward Scattering Spectrometry

Hydrogen Forward Scattering Spectrometry (HFS) is an ion scattering technique that is used to quantitatively determine the vertical distribution of hydrogen in thin films.

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Hydrogen Forward Scattering Spectrometry ([HFS](https://covalent.com/techniques/chemical-analysis/dynamic-secondary-ion-mass-spectrometry-dsims/)) is an ion scattering technique that is used to quantitatively determine the vertical distribution of hydrogen in thin films. During the process, He2+ ions hit the sample surface at a glancing angle, knocking hydrogen atoms out of the sample, which can then be analyzed using a solid state detector.

The ability to measure the composition and vertical distribution of hydrogen content within a thin film can be critical due to the potential impact of hydrogen on a film’s physical or electrical properties. Other techniques, such as Auger Electron Spectroscopy (AES), Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Photoelectron Spectroscopy (XPS), cannot detect hydrogen; and while SIMS can measure hydrogen, quantification of the hydrogen by SIMS can be difficult and requires standards. This makes HFS a uniquely useful technique for thin film analysis.

## Ideal Uses of HFS

*   Depth profiling of Hydrogen in thin films

## Strengths

*   Non-destructive H composition measurement
*   Whole wafer analysis (up to 300 mm)
*   Conductor and insulator analysis

## Limitations

*   Large analysis area (1×7 mm)
*   Useful information limited to thin films (<0.4 μm)
*   Depth resolution of 300 Å

## Technical Specifications

*   **Signal Detected:** Forward scattered H atoms
*   **Elements Detected:** 1H, 2H
*   **Detection Limits:** 0.1-0.5 at%
*   **Depth Resolution:** ~300 Å
*   **Imaging/Mapping:** No
*   **Lateral Resolution/Probe Size:** ≥1×7 mm